Cambodia community action

Cambodia is highly vulnerable to the effects of climate change. Extreme weather events will occur more frequently; this includes floods, which already affect 90,000 residents annually, and heatwaves, with Cambodia already having one of the highest temperatures of the world. The temperature has increased since the 1960s by 0.18 °C per decade. It had the 7th lowest CO₂ emissions in Asia in 2019.

Climate change is leading to increased drought in Cambodia, which is having major impacts on the Tonlé Sap and Mekong deltas. These water systems are highly important for water, agriculture and fishing in the country. Cambodia's population is impacted by increasing floods, tropical cyclones and waterborne diseases, and is highly vulnerable due to its high rate of poverty.

In 2020 Cambodia reported 15.33 mt in CO₂ emissions and is responsible for 0.04% in 2019 and cumulatively 0.01% of worldwide CO₂ emissions. The per capita CO₂ emissions in 2019 were 0.97t since 2013 a big increase in CO₂ emissions was observed with an increase of 192.69% between 2013 and 2019. 143.84 mt of CO₂ emissions have been emitted between 1751 and 2019.

The temperature has increased 0.18 °C per decade since 1980. Cambodia already has one of the highest temperatures in the world with 35 °C being recorded for 64 days a year nationally. These temperatures will rise in all RCP scenarios which could lead to permanent heat stress. The probability of droughts in 2080-2099 will rise from 4% annually to 5-9% under all scenarios.

The sub-daily precipitation will likely increase in intensity. Around 90.000 people are annually exposed to flooding in Cambodia, in RCP 8.5 scenario this will increase to 160.000 people annually. A study that was done by the World Bank expects that in 2050 19% of the population will be exposed to flooding.

A major climate change issue for Cambodia is the impact it has on the Tonlé Sap lake and Mekong river system. Climate change will impact water flow in the country and increase the frequency of droughts. Hydropower dams have further exacerbated the issue.

Impacts on the Tonlé Sap lake and Mekong will have considerable implications for agriculture and fishing in the country. The Cambodian population, which has a high rate of poverty, is highly vulnerable to the impacts of climate change on tropical cyclones, floods and waterborne diseases.

UNICEF ranked Cambodia 46th out of 163 that they assessed on the impact of climate change on the youth. Cambodia was ranked as a high risk country in the report. The youth in Cambodia is already highly exposed to scarcity of water, riverine flooding and vector-borne disease which could worsen with the effects of climate change.

The Cambodian government pledges to reduce emissions by 41.7% in 2030.

• Tonlé Sap
• Climate change in Vietnam
• Climate change in Thailand
• Deforestation in Cambodia

Cambodia is highly vulnerable to the effects of climate change. Extreme weather events will occur more frequently; this includes floods, which already affect 90,000 residents annually, and heatwaves, with Cambodia already having one of the highest temperatures of the world. The temperature has increased since the 1960s by 0.18 °C per decade. It had the 7th lowest CO₂ emissions in Asia in 2019.

Climate change is leading to increased drought in Cambodia, which is having major impacts on the Tonlé Sap and Mekong deltas. These water systems are highly important for water, agriculture and fishing in the country. Cambodia's population is impacted by increasing floods, tropical cyclones and waterborne diseases, and is highly vulnerable due to its high rate of poverty.

In 2020 Cambodia reported 15.33 mt in CO₂ emissions and is responsible for 0.04% in 2019 and cumulatively 0.01% of worldwide CO₂ emissions. The per capita CO₂ emissions in 2019 were 0.97t since 2013 a big increase in CO₂ emissions was observed with an increase of 192.69% between 2013 and 2019. 143.84 mt of CO₂ emissions have been emitted between 1751 and 2019.

The temperature has increased 0.18 °C per decade since 1980. Cambodia already has one of the highest temperatures in the world with 35 °C being recorded for 64 days a year nationally. These temperatures will rise in all RCP scenarios which could lead to permanent heat stress. The probability of droughts in 2080-2099 will rise from 4% annually to 5-9% under all scenarios.

The sub-daily precipitation will likely increase in intensity. Around 90.000 people are annually exposed to flooding in Cambodia, in RCP 8.5 scenario this will increase to 160.000 people annually. A study that was done by the World Bank expects that in 2050 19% of the population will be exposed to flooding.

A major climate change issue for Cambodia is the impact it has on the Tonlé Sap lake and Mekong river system. Climate change will impact water flow in the country and increase the frequency of droughts. Hydropower dams have further exacerbated the issue.

Impacts on the Tonlé Sap lake and Mekong will have considerable implications for agriculture and fishing in the country. The Cambodian population, which has a high rate of poverty, is highly vulnerable to the impacts of climate change on tropical cyclones, floods and waterborne diseases.

UNICEF ranked Cambodia 46th out of 163 that they assessed on the impact of climate change on the youth. Cambodia was ranked as a high risk country in the report. The youth in Cambodia is already highly exposed to scarcity of water, riverine flooding and vector-borne disease which could worsen with the effects of climate change.

The Cambodian government pledges to reduce emissions by 41.7% in 2030.

• Tonlé Sap
• Climate change in Vietnam
• Climate change in Thailand
• Deforestation in Cambodia

Deforestation in Cambodia has increased in recent years. Cambodia is one of the world's most forest endowed countries, that was not historically widely deforested. However, massive deforestation for economic development threatens its forests and ecosystems. As of 2015, the country has one of the highest rates of deforestation in the world.

Deforestation has directly resulted from poorly managed commercial logging, fuel wood collection, agricultural invasion, and infrastructure and urban development. Indirect pressures include rapid population growth, inequalities in land tenure, lack of agriculture technology, and limited employment opportunities.

The Cambodian government has played a large role in shaping the use of the country's forests. An unusually large area of Cambodia has been designated as protected areas and biodiversity corridors, over 38% (more than 7 million hectares) of the total land mass, but many protections have subsequently been overruled by concessions sold to both national and foreign companies for agroindustrial plantations and mining developments, even in national parks.

Deforestation in Cambodia has increased in recent years. Cambodia is one of the world's most forest endowed countries, that was not historically widely deforested. However, massive deforestation for economic development threatens its forests and ecosystems. As of 2015, the country has one of the highest rates of deforestation in the world.

Deforestation has directly resulted from poorly managed commercial logging, fuel wood collection, agricultural invasion, and infrastructure and urban development. Indirect pressures include rapid population growth, inequalities in land tenure, lack of agriculture technology, and limited employment opportunities.

The Cambodian government has played a large role in shaping the use of the country's forests. An unusually large area of Cambodia has been designated as protected areas and biodiversity corridors, over 38% (more than 7 million hectares) of the total land mass, but many protections have subsequently been overruled by concessions sold to both national and foreign companies for agroindustrial plantations and mining developments, even in national parks.

The Cambodian government has been broadly criticized domestically and internationally for these contradicting policies, and a general lack of enforcement of environmental laws. They have faced pressures to practice a more sustainable forestry overall. The fate of Cambodia's forests will largely affect local communities that rely on the forests for their livelihood. Around 80% of its population lives in rural areas.

Cambodia's primary forest cover fell dramatically from over 70% in 1970 at the end of the Vietnam War to just 3.1% in 2007, when less than 3,220 square kilometers of primary forest remained. Deforestation is proceeding at an alarming rate: nearly 75% of forest loss has occurred since the end of 1990s. In total, Cambodia lost 25,000 square kilometers of forest between 1990 and 2005, 3,340 square kilometer of which was primary forest. As of 2016, 87,424 square kilometers of forest remained including 28, 612 square kilometers of evergreen forest, with the result that the future sustainability of Cambodia's forest reserves is under severe threat.

Open Development Cambodia, an NGO in Phnom Penh, Cambodia, used US satellite data to show a significant loss of forest cover from 72.1% in 1973 to 46.3% in 2014. Most of the loss occurred after 2000. Since 2001, the Royal Government of Cambodia (RGC) has suspended all the forest concession activities and prepared a sustainable forest management plan according to international standards.

In an effort to conserve forest cover, a limited amount of forest is allowed to be cut annually though a bidding process in order to supply the domestic timber demand. A harvest limit of 0.8m³ per hectare has been established with a 13-year cutting cycle, according to the National Forest Programme 2010-2029.

The RGC has set a Cambodia Millennium Development Goal to maintain national cover of 60% of total land area by 2015. This would require 532,615 hectares of non-forest land to be converted to forest land. However, as 2016, the forest cover remains 48.14%, equivalent to 87, 424 square kilometers.

Forest distribution varies nationwide. As of 2016, the hilly northwest and southest region have the highest forest coverage rate. Among 25 provinces, 7 provinces have forest cover of more than 60%. If the Cambodian government does not move toward a more sustainable forest management, the value of Cambodia's forests is likely to decline.

The Royal Government of Cambodia (RGC) sees great potential in Cambodia's forests to further the country's development. The government can use timber exports to acquire foreign currencies and create necessary revenue to support reconstruction and development. The World Bank considered the forest to be “one of the few important resources for development in Cambodia.” Starting in 1992, the RGC used revenue generated from the sale of forest products to finance various development projects.

Forest revenues as a percent of total government revenues decreased from 14 percent in 1994 to 5 percent in 1996. This revenue decrease and visible mismanagement of the forest sector spurred the IMF, World Bank, Food and Agriculture Organization, and the United Nations Development Program in 1994 and 1995 to review Cambodia's forest policies. Some forest policies have been reformed however the causes of deforestation cannot be fixed solely through policy.

Despite potential gains from utilizing forest resources, the government has faced pressures from domestic and international groups that are concerned about deforestation. Domestically, local communities rely on forests for timber and non-timber resources, as well as the positive contributions of the forest to rice farming and fisheries. Internationally, there are many nongovernment organizations and environmental organizations that have expressed concern over deforestation in Cambodia. In the 1990s, the Cambodian government passed and lifted many government bans on timber exports as a result from these pressures.

There are some barriers to forest development and sustainable forest management. In 1999, 35% to 40% of the forests were considered dangerous due to land mines, ongoing conflicts, and rogue armed forces. Cambodia has the highest number of land mines per capital. Land mines have prevented the utilization of forests. Another barrier is an absence of reliable data on existing forests relating to their extent, composition, and problems of access. Cambodia has very little data on their environment due to their prolonged civil war. UN organizations and international NGOs support most of the environmental activities such as collecting data. In addition, estimates of forestry output are unknown but are assumed to be over the legal mount due to illegal cutting.

Global Witness, a British NGO, criticizes RGC's management of forests. In a briefing document published in 1996, Global Witness describes how the RGC secretly creates forest policies that benefit them, their allies in the Thai government, and foreign businesses. Global Witness asserts that RGC's management of Cambodia's forest goes against the Cambodian Constitution. One example the Global Witness draws on to illustrate the collusion occurring within the RGC is the 1995 ban of cutting fresh timber and timber exports. Publicly the RGC implemented this two-year ban in order to fully assess the state of forests around the country with an ultimate goal to create a sustainable development plan for future forest use.

However, during this time, the RGC privately participated in forest concessions with foreign companies. One point of contention is that these forest concessions required the approval of only three government officials: the two Prime Ministers and the Minister of Agriculture. Global Witness argues that the fate of Cambodia's forests and therefore livelihoods of many Cambodians rested in a few hands of those with opposing interests.

Global Witness also says a vast illegal logging operation is driving the country's rarest tree species to the brink of extinction with government and military officials acting with impunity to keep the operation functioning. Another Global Witness report in 2015 said, "government and industry insiders, including people who work for Okhna Try Pheap, indicated that entrenched corruption had ensured loggers in his network were given safe passage and immunity from timber confiscations and penalties."

This report also named Cambodian timber magnate Try Pheap at the center of a large illegal logging enterprise driving Cambodia's rarest tree species to the brink of extinction. The report concludes that the operation of the illegal logging is being done with the collusion of government and military officials with virtually all of the illegally cut and transported wood going to China.

The last decade has seen central forest management placing a priority on commercial timber interests which often coincide with large scale deforestation. By 1999, over 4.7 million hectares were granted to 25 private companies for commercial logging. The wood production in 1997 is this country was 3.4 million cubic meters which 5 times over the sustainable forest yield. Environmental and social aspects of sustainable forest management were largely ignored. This has led to over-logging, conflicts with local communities over rights, and limited contribution to national development and poverty alleviation.

Foreign enterprises began to take part in commercial logging after the Paris Peace Agreement in 1991. The period of 1994–96 saw an increase of forest concessions to private companies which reflected the RGC's move toward liberalizing its economy. In 1996, the World Band, United Nations Development Program, and Food and Agriculture Organization advocated for market-oriented policy reform regarding the management of Cambodia's forests in order to increase forest revenue and avoid overexploitation.

There are two kinds of agreements concerning commercial logging: investment agreement and forest timber license. Investment agreements are concessions are given to those who have invested in facilities for logging and wood processing. Forest timber licenses are contracts signed between an enterprise and senior government officials. The details of the contract are not open to the public. The details of the contract have limited public transparency, but 84 concession agreements are accessible through the open data portal of Open Development Cambodia. The contract often includes sustainable forestry guidelines but they are rarely enforced.

The international price for forests are $74/cubic meter compared to $14/cubic meter in Cambodia. The undervaluing of Cambodian forests has contributed to foreign acquisition and loss of profit for Cambodia.

Cambodia has implemented economic land concessions (ELCs) for agro-industrial development and forest land concessions, in effort to liberalize their economy. Supporters of the policy argue that ELCs to encourage investment from abroad, new technology for agriculture, linking of trade markets, and create new jobs. On the other hand, critics of the policy argue that ELCs will disposes local communities of their land rights, threaten their livelihood, and create social problems. The granted concessions often overlap with occupied community lands. In 2014, around one third of the land conflict occurred in Cambodia was caused by economic land concessions (97 out of 308 land conflict cases).

As of 2015, economic land concessions (15,300 square kilometers in 18 provinces) were granted to 267 companies, including 3,800 square kilometers of protected area, according to the NGO Forum on Cambodia. Another source from LICADO, shows that the total size of ELC was 18,300 square kilometers granted to 228 companies, of which 96 are locally owned 128 are foreign owned, and the remaining 4 are unknown.

The biggest criticism of land concessions for economic purposes is the lack of transparency. Often, distribution of the land concessions and the use of the land is unknown outside of the government and those granted land concessions. Often land concessions have been cleared but not cultivated. This raises questions to whether the land concessions were for productive development or land grabbing.

Illegal logging poses a large threat to Cambodia's forests. It allows for undocumented and unauthorized deforestation in which allows for the exploitation of Cambodia's forests. There are many cases in which the military carries out illegal logging without knowledge from the government. It is difficult for central government officials to visit areas still controlled by former Pol Pot forces. Illegal commercial timber interests take advantage of weak law enforcement to benefit from illegal cutting. The majority of illegal deforestation is done by the military and powerful sub-contractors.

The Cambodian population has increased gradually with the annual growth rate over 1.5% since 2005. As of 2019, the total population increased to 15.29 million people, according to provisional results from Cambodia’s 2019 census. The 2019 census shows that the provinces with high forest cover rate have a high annual growth rate: Preah Vihear province (3.5%), followed by Mondul Kiri (3.4%), Stung Treng (3.2%), Otdar Meanchey (3.1%) and Ratanak Kiri (2.8%). Cambodians living near or in forests depend on forests resources for a variety of products and services. Forest-dependent people almost exclusively extract non-timber forest products, rather than timber extraction. Non-timber forest products are used for both subsistence and commercial purposes. Non-Timber forest products include food, medicine, agricultural inputs, and fuel. Forest dwelling people and indigenous entrepreneurs have relied on the forest as a vital source of income for nearly two thousand years.

Timber resources are used for building materials, firewood, and charcoal production. The use of fossil fuels is rare in Cambodia; fuelwood represents 90% of its energy supply. Fuelwood production has been the main cause of deforestation in locations such as the inundated forest of Tonle Sap. Garment factories in Cambodia have contributed to deforestation by using firewood to generate electricity.

A study conducted by the Cambodia Development Resource Institute found that poor households in the survey gained 42 percent of their livelihood value from forests, equal to $200/household annually. Medium households obtained an average of 30 percent of their livelihood value from forests, equal to $345/household annually. The forests contribute greatly to the livelihoods of rural households living near forests. Deforestation negatively affects these communities by threatening their livelihoods. The poor, who have restricted access to various resources and means of income are more dependent on forest resources. Forest management should be integrated with Environmental rural development and poverty reduction strategies.

The international timber trade drives demand for Cambodian forest wood. A great deal of timber from Cambodian forests is exported to China and neighbouring Vietnam.

Cambodia's forests are important on a national and global scale. Forests provide positive impacts on their surroundings such as watershed protection, carbon storage, recreation, and biodiversity conservation. In addition, they include scarce primeval tropical rainforests with rich biodiversity and absorb greenhouse gases. In 1999, Cambodia's total forest area was 11 million hectare, which stored 150 tons of carbon each, resulting in Cambodia's forest storing 1.6 billion tons of carbon per year. With every 100,000 hectare of deforestation, 15 million tons of carbon will remain in the atmosphere.

The forests are especially important for water currents that are used to irrigate rice crops. Decrease in forest cover contributes to erosion, flooding, and siltation of streams which compromises water currents which directly support the livelihoods of the Cambodian people.

Deforestation negatively affects the productivity of Cambodia's freshwater bodies which provides food in the form of fish for many Cambodians. The productivity of Cambodia's freshwater bodies, such as the Mekong River, the Great Lake and Tonle Sap River, rely on the inundation of forests. Inundated forests allow for phytoplankton and zooplankton development, shelter for juvenile and adult fish species, and serve as reproduction zones. However, high productivity, biodiversity, and rich vegetation have declined in the last several decades due to deforestation and other environmental degradation and overexploitation.

This has negative impacts on many Cambodians. Around 90% of Cambodia's population is concentrated on the riparian provinces of the Mekong River, the Great Lake, and the Tonle Sap River. Cambodians, especially poor rural rice farmers, rely on the freshwater bodies for subsistence fishing. Freshwater fish is the basic and most prevalent food of Cambodia after rice, it makes up 70% of animal protein in Cambodian diets. Deforestation has decreased fishing capabilities by reducing the area available for productive ecological activities such as breeding in addition to restricting access for fishermen.

Numerous species of globally endangered wildlife inhabitant Cambodia’s forests. Keo Seima Wildlife Sanctuary serves as the habitat for over 60 species listed as Globally Threatened, Near-threatened or Data Deficient by IUCN criteria. Prey Lang Wildlife Sanctuary is home to 50 threatened species and 21 species prioritized for genetic conservation. The decline [MD1] of wildlife species in Cambodia is driven by the depletion of habitat. Deforestation from commercial and illegal logging and land use conversion are the leading causes of the decline or depletion of habitat.

Approximately 200,000 indigenous people always are identified in 24 groups scattered over 15 southwestern and northeastern provinces of Cambodia. They live in remote and isolated areas surrounded by forest[2]. Their livelihoods and culture depend on forests. Their main income, food, clothing, and medicine are based on the collection of non-timber forest products.

The concept of community forestry started in India in the 1970s. It acknowledges that local communities in forest regions have knowledge and skills to use forests in a sustainable manner. Their knowledge is rooted in the ecological, cultural, and social characteristics of the community. In community forests, local residents are given certain rights and become the main actors of forest management. The goal of community forests is not to make profits or directly support the current residents by itself, but rather to promote sustainable and effective use of environmental resources and their fair distribution for the present and future generations.

Community forests, established in 1994 in Cambodia, aims to ensure locals rights to forest resources. This program allows for locals to directly participate in the protection, conservation, and development of forest resources. Some challenges that have arisen are conflicting interests with how to manage forests within communities, the government's reluctance to transfer resource management power to communities, powerful special interests overshadowing local interests, the costs of management, and lack of needed assistance.

Some researchers argue that the community forestry framework requires industrial forestry reform as well as redefined policies for rural development. Despite its shortcomings, this program has grown very popular among those who live in rural areas. As of 2016, 610 communities participate in community forestry, covering 5,066 square kilometers in 21 provinces. Community forests only cover 2.8 percent of Cambodia's land area which is extremely small compared to the concessions given to commercial forestry.

Community forestry units in Cambodia:

The first protected area was established in 1998 under the reign of King Sihanouk. However, the law on protected areas was adopted in 2008 to govern biodiversity and ensure the sustainability of natural resource within the protected areas. This law recognized the rights of indigenous communities and the general public to participate in decision making on managing and conserving biodiversity in a sustainable approach. Community protected areas (CPA) is a mechanism to engage the local community including indigenous people, who are the primary natural resource users, in planning, monitoring and decision making on protected area management. As of 2018, the number of community protected areas has increased to 153 communities within 51 protected areas.

The communities are the ecological safeguards and they cooperate with the Ministry of Environment to patrol the forest and protect against environmental crimes such as illegal logging and poaching. The communities receive income from collecting non-timber products and funding support from government and development partners. Since 2017, more than 32 million USD are provided by international development partners to support nature conservation and protection of protected areas.

Although the law on protected areas gave a legal foundation to the Ministry of Environment (MOE) to govern protected areas, some areas such as conservation area and protected forest are under the governance of the Forestry Administration, the Ministry of Agriculture, Forestry and Fisheries (MAFF). The economic land concession, which is a state land lease to the private sector for agroindustry development, is governed by MOE and MAFF. In April 2016, the RGC decided to transfer 18 conservation forests over 2.6 million hectares from MAFF to MOE while 73 ELC were transferred to the authority of MAFF. In 2017, the RGC has created a 1.4 million-hectare biodiversity conservation corridor which is the bridge connecting protected areas across the whole country.

An environmental code has been drafted since 2015 with public consultation from community, NGO and development partners. This code strengthens the effectiveness of environmental protection, conservation management, and restored natural resources and biodiversity. This law guarantees open access to environmental information and includes guidelines for sustainable resource management and environmental impact assessment for development projects, according to the eleventh draft of the environmental code. The law is in draft 11th as of April 2018.

RGC adopted the National REDD+ Strategy (NRS) 2017 – 2021. This policy established an inter-ministry platform for combating climate change effects through the improvement of natural resources and forest area. REDD+ is a program that allows private companies to purchase and protect carbon stocks from developing countries as a part of cooperate social responsibility (CSR) or climate commitments. These projects provide funding for protected area management, and provide alternative, sustainable land use options compared to other uses like economic land concessions. In 2016, the Walt Disney Corporation purchased carbon credits worth 2.6 million USD from Cambodia. Since 2016, Cambodia has received over 11 million USD from carbon credits.

According to the Forestry Department of the Ministry of Agriculture, the Cambodian government started afforestation projects in 1985. The reforesting plan was 500-800 hectares per year, towards a goal of 100,000 hectares (1000 km². 7,500 hectares (7.5 km²) had been forested by 1997; limited funds prohibited more ambitious coverage.

The annual Arbor Day holiday on 9 July, early in the rainy season, is when Cambodians are encouraged to plant trees. Educational programmes on seeds and soil are offered in schools and temples, and afforestation measures are advertised through TV and radio.

• Climate change in Cambodia
• Hunting in Cambodia

• Community Forestry International - Oddar Meancheay
• FAO - Community Forestry Development in Northwestern Cambodia

The Mekong or Mekong River is a trans-boundary river in East Asia and Southeast Asia. It is the world's twelfth-longest river and the third-longest in Asia with an estimated length of 4,909 km (3,050 mi) and a drainage area of 795,000 km² (307,000 sq mi), discharging 475 km³ (114 cu mi) of water annually.From its headwaters in the Tibetan Plateau, the river runs through Southwest China (where it is officially called the Lancang River), Myanmar, Laos, Thailand, Cambodia, and southern Vietnam. The extreme seasonal variations in flow and the presence of rapids and waterfalls in the Mekong make navigation difficult. Even so, the river is a major trade route between Tibet and Southeast Asia. The construction of hydroelectric dams along the Mekong in the 2000s through the 2020s has caused serious problems for the river's ecosystem, including the exacerbation of drought.

The Mekong or Mekong River is a trans-boundary river in East Asia and Southeast Asia. It is the world's twelfth-longest river and the third-longest in Asia with an estimated length of 4,909 km (3,050 mi) and a drainage area of 795,000 km² (307,000 sq mi), discharging 475 km³ (114 cu mi) of water annually.From its headwaters in the Tibetan Plateau, the river runs through Southwest China (where it is officially called the Lancang River), Myanmar, Laos, Thailand, Cambodia, and southern Vietnam. The extreme seasonal variations in flow and the presence of rapids and waterfalls in the Mekong make navigation difficult. Even so, the river is a major trade route between Tibet and Southeast Asia. The construction of hydroelectric dams along the Mekong in the 2000s through the 2020s has caused serious problems for the river's ecosystem, including the exacerbation of drought.

The Mekong was originally called Mae Nam Khong from a contracted form of Tai shortened to Mae Khong. In Thai and Lao, Mae Nam ("Mother of Water[s]") is used for large rivers and Khong is the proper name referred to as "River Khong". However, Khong is an archaic word meaning "river", loaned from Austroasiatic languages, such as Vietnamese sông (from *krong) and Mon kruŋ "river", which led to Chinese 江 whose Old Chinese pronunciation has been reconstructed as /*kˤroŋ/ and which long served as the proper name of the Yangtze before becoming a generic word for major rivers. To the early European traders, the Mekong River was also known as Mekon River, May-Kiang River and Cambodia River.

The local names for the river include:

1. From Tai:
   • Thai: แม่น้ำโขง, [mɛ̂ː náːm kʰǒːŋ], or just แม่โขง [mɛ̂ː kʰǒːŋ].
   • Northern Thai: น้ำแม่โขง, [náːm mɛ̂ː kʰǒːŋ], or just น้ำโขง [náːm kʰǒːŋ].
   • Northeastern Thai: แม่น้ำของ, [mɛ̄ː nâːm kʰɔ̌ːŋ], or just แม่ของ [mɛ̄ː kʰɔ̌ːŋ].
   • Lao: ແມ່ນ້ຳຂອງ, [mɛ̄ː nâːm kʰɔ̌ːŋ], or just ນ້ຳຂອງ [nâːm kʰɔ̌ːŋ].
   • Tai Lue: น้ำแม่ของ [nâːm mɛː kʰɔ̌ːŋ], น้ำของ [nâːm kʰɔ̌ːŋ].
   • Shan: ၼမ်ႉၶွင် [nâm.kʰɔ̌ŋ] or ၼမ်ႉမႄႈၶွင် [nâm.mɛ.kʰɔ̌ŋ].
2. Other:
   • Vietnamese: Sông Mê Kông (IPA: [ʂə̄wŋm mē kə̄wŋm]) or Sông Cửu Long, (九龍 Nine Dragons River [ʂə̄wŋm kɨ̂w lāwŋm]).
   • Chinese: 湄公河; Méigōng hé.
   • Burmese: မဲခေါင်မြစ်, IPA: [mɛ́ɡàʊɰ̃ mjɪ̰ʔ].
   • Khmer: ទន្លេធំ Tônlé Thum [tɔnlei tʰum] (lit. "Big River" or "Great River") or មេគង្គ Mékôngk [meːkɔŋ], ទន្លេមេគង្គ Tônlé Mékôngk [tɔnlei meikɔŋ].
   • Khmuic: [ŏ̞m̥ kʰrɔːŋ̊], 'ŏ̞m̥' means 'river' or 'water', here it means 'river', 'kʰrɔːŋ̊' means 'canal'. So 'ŏ̞m̥ kʰrɔːŋ̊' means 'canal river'. In the ancient time Khmuic people called it '[ŏ̞m̥ kʰrɔːŋ̊ ɲă̞k̥]' or '[ŏ̞m̥ kʰrɔːŋ̊ ɟru̞ːʔ]' which means 'giant canal river' or 'deep canal river' respectively.

The Mekong rises as the Za Qu (Tibetan: རྫ་ཆུ་, Wylie: rDza chu, ZYPY: Za qu; Chinese: 扎曲; pinyin: Zā Qū) and soon becomes known as the Lancang River (simplified Chinese: 澜沧江; traditional Chinese: 瀾滄江; pinyin: Láncāng Jiāng, from the old name of Lao kingdom Lan Xang; the characters may also be literally understood as "turbulent green river"). It originates in the "three rivers source area" on the Tibetan Plateau in the Sanjiangyuan National Nature Reserve. The reserve protects the headwaters of, from north to south, the Yellow (Huang He), the Yangtze, and the Mekong Rivers. It flows through the Tibetan Autonomous Region and then southeast into Yunnan Province, and then the Three Parallel Rivers Area in the Hengduan Mountains, along with the Yangtze to its east and the Salween River (Nu Jiang in Chinese) to its west.

Then the Mekong meets the China–Myanmar border and flows about 10 km (6.2 mi) along that border until it reaches the tripoint of China, Myanmar and Laos. From there it flows southwest and forms the border of Myanmar and Laos for about 100 km (62 mi) until it arrives at the tripoint of Myanmar, Laos, and Thailand. This is also the point of confluence between the Ruak River (which follows the Thai–Myanmar border) and the Mekong. The area of this tripoint is sometimes termed the Golden Triangle, although the term also refers to the much larger area of those three countries that was notorious as a drug producing region.

From the Golden Triangle tripoint, the Mekong turns southeast to briefly form the border of Laos with Thailand.

Khon Pi Long is a series of rapids along a 1.6-kilometre section of the Mekong River dividing Chiang Rai and Bokeo Province in Laos. The name of the rapids means 'where the ghost lost its way'. It then turns east into the interior of Laos, flowing first east and then south for some 400 km (250 mi) before meeting the border with Thailand again. Once more, it defines the Laos-Thailand border for some 850 km (530 mi) as it flows first east, passing the capital of Laos, Vientiane, then turns south. A second time, the river leaves the border and flows east into Laos soon passing the city of Pakse. Thereafter, it turns and runs more or less directly south, crossing into Cambodia.

At Phnom Penh the river is joined on the right bank by the river and lake system the Tonlé Sap. When the Mekong is low, the Tonle Sap is a tributary: water flows from the lake and river into the Mekong. When the Mekong floods, the flow reverses: the floodwaters of the Mekong flow up the Tonle Sap.

Immediately after the Sap River joins the Mekong by Phnom Penh, the Bassac River branches off the right (west) bank. The Bassac River is the first and main distributary of the Mekong. This is the beginning of the Mekong Delta. The two rivers, the Bassac to the west and the Mekong to the east, enter Vietnam shortly after this. In Vietnam, the Bassac is called the Hậu River (Sông Hậu or Hậu Giang); the main, eastern, branch of the Mekong is called the Tiền River or Tiền Giang. In Vietnam, distributaries of the eastern (main, Mekong) branch include the Mỹ Tho River, the Ba Lai River, the Hàm Luông River, and the Cổ Chiên River.

The Mekong Basin if frequently divided into two parts: the "upper Mekong basin" comprising those parts of the basin in Tibet, Yunnan and eastern Myanmar, and the "lower Mekong basin" from Yunnan downstream from China to the South China Sea. From the point where it rises to its mouth, the most precipitous drop in the Mekong occurs in the upper Mekong basin, a stretch of some 2,200 km (1,400 mi). Here, it drops 4,500 m (14,800 ft) before it enters the lower basin where the borders of Thailand, Laos, China, and Myanmar come together in the Golden Triangle. Downstream from the Golden Triangle, the river flows for a further 2,600 km (1,600 mi) through Laos, Thailand, and Cambodia before entering the South China Sea via a complex delta system in Vietnam.

The upper basin makes up 24% of the total area and contributes 15–20% of the water that flows into the Mekong River. The catchment here is steep and narrow with Soil erosion being a major problem and as a result of this, approximately 50% of the sediment in the river comes from the upper basin.

In Yunnan Province in China, the river and its tributaries are confined by narrow, deep gorges. The tributary river systems in this part of the basin are small. Only 14 have catchment areas that exceed 1,000 km² (390 sq mi), yet the greatest amount of loss of forest cover in the entire river system per square kilometer has occurred in this region due to heavy unchecked demand for natural resources. In the south of Yunnan, in Simao and Xishuangbanna Prefectures, the river changes as the valley opens out, the floodplain becomes wider, and the river becomes wider and slower.

Major tributary systems develop in the lower basin. These systems can be separated into two groups: tributaries that contribute to the major wet season flows, and tributaries that drain low relief regions of lower rainfall. The first group are left bank tributaries that drain the high rainfall areas of Laos. The second group are those on the right bank, mainly the Mun and Chi Rivers, that drain a large part of northeast Thailand.

Laos lies almost entirely within the lower Mekong basin. Its climate, landscape and land use are the major factors shaping the hydrology of the river. The mountainous landscape means that only 16% of the country is farmed under lowland terrace or upland shifting cultivation. With upland shifting agriculture (slash and burn), soils recover within 10 to 20 years but the vegetation does not. Shifting cultivation is common in the uplands of northern Laos and is reported to account for as much as 27% of the total land under rice cultivation. As elsewhere in the basin, forest cover has been steadily reduced during the last three decades by shifting agriculture and permanent agriculture. The cumulative impacts of these activities on the river regime have not been measured. However, the hydrological impacts of land cover changes induced by the Vietnam War were quantified in two sub-catchments of the lower Mekong River basin.

Loss of forest cover in the Thai areas of the lower basin has been the highest of all the lower Mekong countries over the past 60 years. On the Khorat Plateau, which includes the Mun and Chi tributary systems, forest cover was reduced from 42% in 1961 to 13% in 1993. Although this part of northeast Thailand has an annual rainfall of more than 1,000 mm, a high evaporation rate means it is classified as a semi-arid region. Consequently, although the Mun and Chi basins drain 15% of the entire Mekong basin, they only contribute 6% of the average annual flow. Sandy and saline soils are the most common soil types, which makes much of the land unsuitable for wet rice cultivation. In spite of poor fertility, however, agriculture is intensive. Glutinous rice, maize, and cassava are the principal crops. Drought is by far the major hydrological hazard in this region.

As the Mekong enters Cambodia, over 95% of its flows have already joined the river. From here on downstream the terrain is flat and water levels rather than flow volumes determine the movement of water across the landscape. The seasonal cycle of changing water levels at Phnom Penh results in the unique "flow reversal" of water into and out of the Great Lake via the Tonle Sap River. Phnom Penh also marks the beginning of the delta system of the Mekong River. Here the mainstream begins to break up into an increasing number of branches.

In Cambodia, wet rice is the main crop and is grown on the flood plains of the Tonle Sap, Mekong, and Bassac (the Mekong delta distributary known as the Hậu in Vietnam) Rivers. More than half of Cambodia remains covered with mixed evergreen and deciduous broadleaf forest, but forest cover has decreased from 73% in 1973 to 63% in 1993. Here, the river landscape is flat. Small changes in water level determine the direction of water movement, including the large-scale reversal of flow into and out of the Tonle Sap basin from the Mekong River.

The Mekong Delta in Vietnam is farmed intensively and has little natural vegetation left. Forest cover is less than 10%. In the Central Highlands of Vietnam, forest cover was reduced from over 95% in the 1950s to around 50% in the mid-1990s. Agricultural expansion and population pressure are the major reasons for land use and landscape change. Both drought and flood are common hazards in the Delta, which many people believe is the most sensitive to upstream hydrological change.

Table 1: Country share of Mekong River Basin (MRB) and water flows

By taking into account hydrological regimes, physiography land use, and existing, planned and potential resource developments, the Mekong is divided into six distinct reaches:

Reach 1: Lancang Jiang or Upper Mekong River in China. In this part of the river, the major source of water flowing into the river comes from melting snow on the Tibetan plateau. This volume of water is sometimes called the "Yunnan component" and plays an important role in the low-flow hydrology of the lower mainstream. Even as far downstream as Kratie, the Yunnan component makes up almost 30% of the average dry season flow. A major concern is that the ongoing and planned expansion of dams and reservoirs on the Mekong mainstream in Yunnan could have a significant effect on the low-flow regime of the lower Mekong basin system.

Reach 2: Chiang Saen to Vientiane and Nong Khai. This reach is almost entirely mountainous and covered with natural forest although there has been widespread slash and burn agriculture. Although this reach cannot be termed "unspoiled", the hydrological response is perhaps the most natural and undisturbed of all the lower basin. Many hydrological aspects of the lower basin start to change rapidly at the downstream boundary of this reach.

On 19 July 2019 this reach of the river dropped to its lowest level in a century. Officials are particularly concerned as July is in the wet season, when mainstream flows are abundant historically. Locals are blaming low water on the newly constructed Xayaburi Dam, as it enters its test phase prior to the start of commercial operation in October 2019.

Reach 3: Vientiane and Nong Khai to Pakse. The boundary between Reach 2 and 3 is where the Mekong hydrology starts to change. Reach 2 is dominated in both wet and dry seasons by the Yunnan Component. Reach 3 is increasingly influenced by contributions from the large left bank tributaries in Laos, namely the Nam Ngum, Nam Theun, Nam Hinboun, Se Bang Fai, Se Bang Hieng and Se Done Rivers. The Mun-Chi river system from the right bank in Thailand enters the mainstream within this reach.

Reach 4: Pakse to Kratie. The main hydrological contributions to the mainstream in this reach come from the Se Kong, Se San, and Sre Pok catchments. Together, these rivers make up the largest hydrological sub-component of the lower basin. Over 25% of the mean annual flow volume to the mainstream at Kratie comes from these three river basins. They are the key element in the hydrology of this part of the system, especially to the Tonle Sap flow reversal.

Reach 5: Kratie to Phnom Penh. This reach includes the hydraulic complexities of the Cambodian floodplain, the Tonle Sap and the Great Lake. By this stage, over 95% of the total flow has entered the Mekong system. The focus turns from hydrology and water discharge to the assessment of water level, over- bank storage and flooding and the hydrodynamics that determine the timing, duration and volume of the seasonal flow reversal into and out of the Great Lake.

Reach 6: Phnom Penh to the South China Sea. Here the mainstream divides into a complex and increasingly controlled and artificial system of branches and canals. Key features of flow behaviour are tidal influences and salt water intrusion. Every year, 35–50% of this reach is flooded during the rainy season. The impact of road embankments and similar infrastructure developments on the movement of this flood water is an increasingly important consequence of development.

Table 2 summarises the mean annual flows along the mainstream. The mean annual flow entering the lower Mekong from China is equivalent to a relatively modest 450 mm depth of runoff. Downstream of Vientiane this increases to over 600 mm as the principal left bank tributaries enter the mainstream, mainly the Nam Ngum and Nam Theun. The flow level falls again, even with the right bank entry of the Mun-Chi system from Thailand. Although the Mun–Chi basin drains 20% of the lower system, average annual runoff is only 250 mm. Runoff in the mainstream increases again with the entry from the left bank of the Se Kong from southern Laos and Se San and Sre Pok from Vietnam and Cambodia.

Table 2: Lower Mekong Mainstream annual flow (1960 to 2004) at selected sites.

Flows at Chiang Saen entering the lower basin from Yunnan make up about 15% of the wet season flow at Kratie. This rises to 40% during the dry season, even this far downstream. During the wet season, the proportion of average flow coming from Yunnan rapidly decreases downstream of Chiang Saen, from 70% to less than 20% at Kratie. The dry season contribution from Yunnan is much more significant. The major portion of the balance comes from Laos, which points to a major distinction in the low-flow hydrology of the river. One fraction comes from melting snow in China and Tibet and the rest from over-season catchment storage in the lower basin. This has implications for the occurrence of drought conditions. For example, if runoff from melting snow in any given year is very low, then flows upstream of Vientiane-Nong Khai would be lower.

In a large river system like the Mekong, seasonal flows can be quite variable from year to year. Although the pattern of the annual hydrograph is fairly predictable, its magnitude is not. The average monthly flows along the mainstream are listed in Table 3, providing an indication of their range and variability from year to year. At Pakse, for example, flood season flows during August would exceed 20,000 cubic metres per second nine years out of ten, but exceed 34,000 m³/s only one year in ten.

Table 3: Mekong Mainstream monthly discharge, 1960–2004 (m³/s).

There is little evidence from the last 45 years of data of any systematic changes in the hydrological regime of the Mekong.

The internal drainage patterns of the Mekong are unusual when compared to those of other large rivers. Most large river systems that drain the interiors of continents, such as the Amazon, Congo, and Mississippi, have relatively simple dendritic tributary networks that resemble a branching tree.

Typically, such patterns develop in basins with gentle slopes where the underlying geological structure is fairly homogeneous and stable, exerting little or no control on river morphology. In marked contrast, the tributary networks of the Salween, Yangtze, and particularly the Mekong, are complex with different sub-basins often exhibiting different, and distinct, drainage patterns. These complex drainage systems have developed in a setting where the underlying geological structure is heterogeneous and active, and is the major factor controlling the course of rivers and the landscapes they carve out.

The elevation of the Tibetan Plateau during the Tertiary period was an important factor in the genesis of the south-west monsoon, which is the dominant climatic control influencing the hydrology of the Mekong Basin. Understanding the nature and timing of the elevation of Tibet (and the Central Highlands of Vietnam) therefore helps explain the provenance of sediment reaching the delta and the Tonle Sap Great Lake today. Studies of the provenance of sediments in the Mekong delta reveal a major switch in the source of sediments about eight million years ago (Ma). From 36 to 8 Ma the bulk (76%) of the sediments deposited in the delta came from erosion of the bedrock in the Three Rivers Area. From 8 Ma to the present, however, the contribution from the Three Rivers Area fell to 40%, while that from the Central Highlands rose from 11 to 51%. One of the most striking conclusions of provenance studies is the small contribution of sediment from the other parts of the Mekong basin, notably the Khorat Plateau, the uplands of northern Laos and northern Thailand, and the mountain ranges south of the Three Rivers area.

The last glacial period came to an abrupt end about 19,000 years ago (19 ka) when sea levels rose rapidly, reaching a maximum of about 4.5 m above present levels in the early Holocene about 8 ka. At this time the shoreline of the South China Sea almost reached Phnom Penh and cores recovered from near Angkor Borei contained sediments deposited under the influence of tides, and salt marsh and mangrove swamp deposits. Sediments deposited in the Tonle Sap Great Lake about this time (7.9–7.3 ka) also show indications of marine influence, suggesting a connection to the South China Sea. Although the hydraulic relationships between the Mekong and the Tonle Sap Great Lake systems during the Holocene are not well understood, it is clear that between 9,000 and 7,500 years ago the confluence of the Tonle Sap and the Mekong was in proximity to the South China Sea.

The present river morphology of the Mekong Delta developed over the last 6,000 years. During this period, the delta advanced 200 km over the continental shelf of the South China Sea, covering an area of more than 62,500 km². From 5.3 to 3.5 ka the delta advanced across a broad embayment formed between higher ground near the Cambodian border and uplands north of Ho Chi Minh City. During this phase of its development the delta was sheltered from the wave action of long-shore currents and was constructed largely through fluvial and tidal processes. At this time the delta was advancing at a rate of 17–18 m per year. After 3.5 ka, however, the delta had built out beyond the embayment and became subject to wave action and marine currents. These deflected deposition south-eastwards in the direction of the Cà Mau Peninsula, which is one of the most recent features of the delta.

For much of its length the Mekong flows through bedrock channels, i.e., channels that are confined or constrained by bedrock or old alluvium in the bed and riverbanks. Geomorphologic features normally associated with the alluvial stretches of mature rivers, such as meanders, oxbow lakes, cut-offs, and extensive floodplains are restricted to a short stretch of the mainstream around Vientiane and downstream of Kratie where the river develops alluvial channels that are free of control exerted by the underlying bedrock.

The Mekong basin is not normally considered a seismically active area as much of the basin is underlain by the relatively stable continental block. Nonetheless, the parts of the basin in northern Laos, northern Thailand, Myanmar and China do experience frequent earthquakes and tremors. The magnitude of these earthquakes rarely exceeds 6.5 on the Richter magnitude scale and is unlikely to cause material damage.

The difficulty of navigating the river has meant that it has divided, rather than united, the people who live near it. The earliest known settlements date to 210 BCE, with Ban Chiang being an excellent example of early Iron Age culture. The earliest recorded civilization was the 1st century Indianised-Khmer culture of Funan, in the Mekong delta. Excavations at Oc Eo, near modern An Giang, have found coins from as far away as the Roman Empire. This was succeeded by the Khmer culture Chenla state around the 5th century. The Khmer empire of Angkor was the last great Indianized state in the region. From around the time of the fall of the Khmer empire, the Mekong was the front line between the emergent states of Siam and Tonkin (North Vietnam), with Laos and Cambodia, then on the coast, torn between their influence.

The first European to encounter the Mekong was the Portuguese António de Faria in 1540. A European map of 1563 depicts the river, although even by then little was known of the river upstream of the delta. European interest was sporadic: the Spanish and Portuguese mounted some missionary and trade expeditions, while the Dutch Gerrit van Wuysthoff led an expedition up the river as far as Vientiane in 1641–42.

The French invaded the region in the mid-19th century, capturing Saigon in 1861, and establishing a protectorate over Cambodia in 1863.

The first systematic European exploration began with the French Mekong Expedition led by Ernest Doudard de Lagrée and Francis Garnier, which ascended the river from its mouth to Yunnan between 1866 and 1868. Their chief finding was that the Mekong had too many falls and rapids to ever be useful for navigation. The river's source was found by Pyotr Kuzmich Kozlov in 1900.

From 1893, the French extended their control of the river into Laos, establishing French Indochina by the first decade of the 20th century. This lasted until the First and Second Indochina Wars expelled French from its former colony and defeated US-supported governments.

During the wars in Indochina in the 1970s, a significant quantity of explosives (sometimes, entire barges loaded with military ordnance) sank in the Cambodian section of the Mekong (as well as in the country's other waterways). Besides being a danger for fishermen, unexploded ordnance also creates problems for bridge and irrigation systems construction. As of 2013, Cambodian volunteers are being trained, with the support of the Office of Weapons Removal and Abatement within the US State Department Bureau of Political-Military Affairs, to conduct underwater explosive removal.

The many maps of the river basin produced throughout recorded history reflect the region's changing human geography and politics.

In 1995, Laos, Thailand, Cambodia, and Vietnam established the Mekong River Commission (MRC) to manage and coordinate the use and care of the Mekong. In 1996 China and Myanmar became "dialogue partners" of the MRC and the six countries now work together in a cooperative framework. In 2000, the governments of China, Laos, Thailand and Myanmar signed a Agreement on Commercial Navigation on Lancang-Mekong River among the Governments of the People's Republic of China, the Lao People's Democratic Republic, the Union of Myanmar and the Kingdom of Thailand which is the mechanism for cooperation with regard to riverine trade on the upper stretches of the Mekong.

The Mekong basin is one of the richest areas of biodiversity in the world. Only the Amazon boasts a higher level of bio-diversity. Biota estimates for the Greater Mekong Subregion (GMS) include 20,000 plant species, 430 mammals, 1,200 birds, 800 reptiles and amphibians, and an estimated 850 freshwater fish species (excluding euryhaline species mainly found in salt or brackish water, as well as introduced species). The most species rich orders among the freshwater fish in the river basin are cypriniforms (377 species) and catfish (92 species).

New species are regularly described from the Mekong. In 2009, 145 species previously unknown to science were described from the region, including 29 fish species, two bird species, 10 reptiles, five mammals, 96 plants, and six amphibians. Between 1997 and 2015, an average of two new species per week were discovered in the region. The Mekong Region contains 16 WWF Global 200 ecoregions, the greatest concentration of ecoregions in mainland Asia.

No other river is home to so many species of very large fish. The biggest include three species of Probarbus barbs, which can grow up to 1.5 m (5 ft) and weigh 70 kg (150 lb), the giant freshwater stingray (Himantura polylepis, syn. H. chaophraya), which can reach at least 5 m (16 ft) in length and 1.9 m (6 ft 3 in) in width, the giant pangasius (Pangasius sanitwongsei), giant barb (Catlocarpio siamensis) and the endemic Mekong giant catfish (Pangasianodon gigas). The last three can grow up to about 3 m (10 ft) in length and weigh 300 kg (660 lb). All of these have declined drastically because of dams, flood control, and overfishing.

One species of freshwater dolphin, the Irrawaddy dolphin (Orcaella brevirostris), was once common in the whole of the lower Mekong but is now very rare, with only 85 individuals remaining.

Among other wetland mammals that have been living in and around the river are the smooth-coated otter (Lutra perspicillata) and fishing cat (Prionailurus viverrinus).

The endangered Siamese crocodile (Crocodylus siamensis) occurs in small isolated pockets within the northern Cambodian and Laotian portions of the Mekong River. The saltwater crocodile (Crocodylus porosus) once ranged from the Mekong Delta up the river into Tonle Sap and beyond but is now extinct in the river, along with being extinct in all of Vietnam and possibly even Cambodia.

• The headwaters of the Mekong in Zadoi County, Qinghai, China, are protected in Sanjiangyuan National Nature Reserve. The name Sanjiangyuan means "the sources of the Three Rivers". The reserve also includes the headwaters of the Yellow River and the Yangtze.
• The section of the river flowing through deep gorges in Yunnan Province is part of the Three Parallel Rivers of Yunnan Protected Areas, a UNESCO World Heritage Site.
• The Tonle Sap Biosphere Reserve in Cambodia contains the largest lake in Southeast Asia. It is a UNESCO Biosphere reserve.

The low tide level of the river in Cambodia is lower than the high tide level out at sea, and the flow of the Mekong inverts with the tides throughout its stretch in Vietnam and up to Phnom Penh. The very flat Mekong delta area in Vietnam is thus prone to flooding, especially in the provinces of An Giang and Dong Thap (Đồng Tháp), near the Cambodian border.

Aquatic biodiversity in the Mekong River system is the second highest in the world after the Amazon.The Mekong boasts the most concentrated biodiversity per hectare of any river. The largest recorded freshwater fish, a 300 kg giant freshwater stingray in 2022 and previously a 293 kg Mekong giant catfish in 2005, were both caught in the Mekong River.

The commercially valuable fish species in the Mekong are generally divided between "black fish", which inhabit low oxygen, slow moving, shallow waters, and "white fish", which inhabit well oxygenated, fast moving, deeper waters. People living within the Mekong River system generate many other sources of food and income from what are often termed "other aquatic animals" (OAAs) such as freshwater crabs, shrimp, snakes, turtles, and frogs.

OAAs account for about 20% of the total Mekong catch. When fisheries are discussed, catches are typically divided between the wild capture fishery (i.e., fish and other aquatic animals caught in their natural habitat), and aquaculture (fish reared under controlled conditions). Wild capture fisheries play the most important role in supporting livelihoods. Wild capture fisheries are largely open access fisheries, which poor rural people can access for food and income.

Broadly, there are three types of fish habitats in the Mekong: i) the river, including all the main tributaries, rivers in the major flood zone, and the Tonle Sap, which altogether yield about 30% of wild catch landings; ii) rain-fed wetlands outside the river-floodplain zone, including mainly rice paddies in formerly forested areas and usually inundated to about 50 cm, yielding about 66% of wild catch landings; and iii) large water bodies outside the flood zone, including canals and reservoirs yielding about 4% of wild catch landings.

The Mekong Basin has one of the world's largest and most productive inland fisheries. An estimated two million tonnes of fish are landed a year, in addition to almost 500,000 tonnes of other aquatic animals. Aquaculture yields about two million tonnes of fish a year. Hence, the lower Mekong basin yields about 4.5 million tonnes of fish and aquatic products annually. The total economic value of the fishery is between US$3.9 and US$7 billion a year. Wild capture fisheries alone have been valued at US$2 billion a year. This value increases considerably when the multiplier effect is included, but estimates vary widely.

An estimated 2.56 million tonnes of inland fish and other aquatic animals are consumed in the lower Mekong every year. Aquatic resources make up between 47 and 80% of animal protein in rural diets for people who live in the Lower Mekong Basin. Fish are the cheapest source of animal protein in the region and any decline in the fishery is likely to significantly impact nutrition, especially among the poor. Fish are the staple of the diet in Laos and Cambodia, with around 80% of the Cambodian population's annual protein intake coming from fish caught in the Mekong River system, with no alternative source to replace it. An MRC report claims that dam projects on the Mekong River will reduce aquatic life by 40% by 2020, and predicted that 80% of fish will be depleted by 2040. Thailand will be impacted, as its fish stocks in the Mekong will decline by 55%, Laos will be reduced by 50%, Cambodia by 35%, and Vietnam by 30%.

It is estimated that 40 million rural people, more than two-thirds of the rural population in the lower Mekong basin, are engaged in the wild capture fishery. Fisheries contribute significantly to a diversified livelihood strategy for many people, particularly the poor, who are highly dependent on the river and its resources for their livelihoods. They provide a principal form of income for numerous people and act as a safety net and coping strategy in times of poor agricultural harvests or other difficulties. In Laos alone, 71% of rural households (2.9 million people) rely on fisheries for either subsistence or additional cash income. Around the Tonle Sap Lake in Cambodia, more than 1.2 million people live in fishing communes and depend almost entirely on fishing for their livelihoods.

Dams in the Mekong reference those built for hydropower, irrigation and other uses (such as water supply). As of February 2024, dams in the Mekong are distributed as follows:

Table 4: Dams in the Mekong River Basin

Notes: HPPs = Hydropower Plants. Data calculated from the CGIAR Research Program on Water, Land and Ecosystems - Greater Mekong 'Dataset on the Dams of the Irrawaddy, Mekong, Red and Salween River Basins'. Only HPPs with an installed capacity of 15 Megawatts (MW) or more are included; and/or dams with a reservoir area of 0.5 km² or more.

There are also multiple HPPs under construction within the basin. As of February 2024, there is one under construction in Cambodia, three in the TAR, and 14 in Laos.

Of the Mekong's HPPs, 15 are located on the Mekong mainstream. Of these, 13 are in China, and two in Laos. An additional mainstream dam is currently under construction in Laos, and another in China.

For thousands of years the Mekong River has been an important conduit for people and goods between the many towns on its banks. Traditional forms of trade in small boats linking communities continue today, however the river is also becoming an important link in international trade routes, connecting the six Mekong countries to each other, and also to the rest of the world. The Mekong is still a wild river and navigation conditions vary greatly along its length. Broadly, navigation of the river is divided between upper and lower Mekong, with the "upper" part of the river defined as the stretch north of the Khone Falls in southern Laos and the "lower" part as the stretch below these falls.

Narrower and more turbulent sections of water in the upstream parts of the Mekong River, coupled with large annual water level variations continue to present a challenge to navigation. The seasonal variations in water level directly affect trade in this section of the river. Volumes of trade being shipped decrease by more than 50%, primarily due to the reduced draughts available during the low water season (June–January). Despite these difficulties, the Mekong River is already an important link in the transit chain between Kunming and Bangkok with about 300,000 tonnes of goods shipped via this route each year. The volume of this trade is expected to increase by 8–11% per year. Port infrastructure is being expanded to accommodate the expected growth in traffic, with new facilities planned for Chiang Saen port.

In Laos, 50 and 100 DWT vessels are operated for regional trade. Cargos carried are timber, agricultural products, and construction materials. Thailand imports a wide variety of products from China, including vegetables, fruit, agricultural products, and fertilisers. The main exports from Thailand are dried longan, fish oil, rubber products, and consumables. Nearly all the ships carrying cargo to and from Chiang Saen Port are 300 DWT Chinese flag vessels.

Waterborne trade in the lower Mekong countries of Vietnam and Cambodia has grown significantly, with trends in container traffic at Phnom Penh port and general cargo through Can Tho port both showing steady increases until 2009 when a decrease in cargo volumes can be attributed to the global financial crisis and a subsequent decline in demand for the export of garments to the US. In 2009, Mekong trade received a significant boost with the opening of a new deep-water port at Cai Mep in Vietnam. This new port has generated a renewed focus on the Mekong River as a trade route. The Cai Mep container terminals can accommodate vessels with a draught of 15.2 m, equivalent to the largest container ships in the world. These mother vessels sail directly to Europe or the United States, which means that goods can be shipped internationally to and from Phnom Penh with only a single transshipment at Cai Mep.

As an international river, a number of agreements exist between the countries that share the Mekong to enable trade and passage between them. The most important of these, which address the full length of the river, are:

• Agreement between China and Lao PDR on Freight and Passenger Transport along the Lancang–Mekong River, adopted in November 1994.
• Agreement on the Cooperation for the Sustainable Development of the Mekong River Basin, Article 9, Freedom of Navigation, 5 April 1995, Chiang Rai.
• Hanoi Agreement between Cambodia and Viet Nam on Waterway Transportation, 13 December 1998.
• Agreement between and among the Governments of the Laos, Thailand, and Vietnam for Facilitation of Cross border Transport of Goods and People, (amended at Yangon, Myanmar), signed in Vientiane, 26 November 1999.
• Agreement on Commercial Navigation on Lancang–Mekong River among the governments of China, Laos, Myanmar and Thailand, adopted at Tachileik, 20 April 2000.
• Phnom Penh Agreement between Cambodia and Vietnam on the Transit of Goods, 7 September 2000.
• New Agreement on Waterway Transportation between Vietnam and Cambodia, signed in Phnom Penh, 17 December 2009.

In December 2016, the Thai cabinet of Prime Minister Prayut Chan-o-cha agreed "in principle" to a plan to dredge stretches of the Mekong and demolish rocky outcrops that are hindrances to easy navigation. The international Lancang-Mekong River navigation improvement plan for 2015–2025, conceived by China, Myanmar, Lao, and Thailand, aims to make the river more navigable for 500-tonne cargo vessels sailing the river from Yunnan to Luang Prabang, a distance of 890 kilometres. China has been the driving force behind the demolition plan as it aims to expand trade in the area. The plan is split into two phases. The first phase, from 2015 to 2020, involves a survey, a design, and an assessment of the environmental and social impacts of the project. These have to be approved by the four countries involved: China, Laos, Myanmar, Thailand. The second phase (2020–2025) involves navigational improvements from Simao in China to 243 border posts in China and Myanmar, a distance of 259 km. Local groups have countered that native inhabitants already operate their boats year-round and that the plan to blast the rapids is not about making life better for local people, but about enabling year-round traffic of large Chinese commercial boats.

On 4 February 2020, the Thai Cabinet voted to stop the project to blast and dredge 97 km of the river bed after Beijing failed to stump up the money for further surveys of the affected area.

Construction of Myanmar–Laos Friendship Bridge started on 19 February 2013. The bridge will be 691.6 m (2,269 ft) long and have an 8.5 m (28 ft) wide two-lane motorway.

The Thai–Lao Friendship Bridge (Thai: สะพานมิตรภาพ ไทย-ลาว, RTGS: Saphan Mittraphap Thai-Lao) connects Nong Khai city with Vientiane in Laos. The 1,170 m-long (3,840 ft) bridge opened on 8 April 1994. It has two 3.5 m-wide (11 ft) lanes with a single railway line in the middle. On 20 March 2004, the Thai and Lao governments agreed to extend the railway to Tha Nalaeng in Laos. This extension has since been completed.

The Second Thai–Lao Friendship Bridge connects Mukdahan to Savannakhet. The two-lane, 12 m-wide (39 ft), 1,600 m-long (5,200 ft) bridge opened to the public on 9 January 2007.

The Third Thai–Lao Friendship Bridge opened for traffic on 11 November 2011, connecting Nakhon Phanom Province (Thailand) and Thakhek (Laos), as part of Asian Highway 3. The Chinese and Thai governments agreed to build the bridge and share the estimated US$33 million cost.

The Fourth Thai–Lao Friendship Bridge opened to traffic on 11 December 2013. It links Chiang Rai Province, Thailand with Ban Houayxay, Laos.

There is one bridge over the Mekong entirely within Laos. Unlike the Friendship Bridges, it is not a border crossing. It is at Pakse in Champasak Province. It is 1,380 m (4,528 ft) long, and was completed in 2000. 15°6′19.95″N 105°48′49.51″E).

The Kizuna Bridge is in Cambodia, in the city of Kampong Cham, on the road linking Phnom Penh with the remote provinces of Ratanakiri and Mondolkiri, and Laos. The bridge opened for traffic on 11 December 2001.

The Prek Tamak Bridge, 40 km (25 mi) north of Phnom Penh opened in 2010.

Phnom Penh itself has no bridge under construction yet, although two new bridges have recently opened on the Tonle Sap, and the main bridge on the highway to Ho Chi Minh was duplicated in 2010.

Another new bridge was built at Neak Leung on the Phnom Penh to Ho Chi Minh Highway 1 with Japanese government assistance, and opened in 2015.

In Vietnam, since the year 2000 Mỹ Thuận Bridge crosses the first channel—the left, main branch of the Mekong, the Sông Tiền or Tiền Giang—near Vĩnh Long and since 2008 Rạch Miễu Bridge crosses it near Mỹ Tho, between the provinces of Tiền Giang and Bến Tre.

Cần Thơ Bridge crosses the second channel—the right, main distributary of the Mekong, the Bassac (Song Hau). Inaugurated in 2010, it is the longest main span cable-stayed bridge in Southeast Asia.

Drought linked to a changing climate and dozens of hydroelectric dams are damaging the Mekong ecosystem. When drought ends and the inevitable floods begin, the effects of Mekong dams on flood pulse dynamics over the entire Lower Mekong are poorly understood.

Sewage treatment is rudimentary in towns and urban areas throughout much of the Mekong's length, such as Vientiane in Laos. Water pollution impacts the river's ecological integrity as a result.

Much of the 8.3 billion tonnes of plastic present on earth makes its way to the oceans. Ninety percent of plastic in the oceans is flushed there by just 10 rivers. The Mekong is one of them.

A growing number of academics, NGOs, and scientists have urged the international community and the Mekong River Commission to reduce the use of hydropower, giving concerns of long-term sustainability. Some of them have urged an immediate moratorium on new construction of hydropower projects and a shift to solar and other forms of renewable energy, which are becoming more competitive and faster to install.

• The WISDOM Project, a Water related Information System for the Mekong Delta
• Mekong River Commission
• CGIAR Research Program on Water, Land and Ecosystems - Greater Mekong Archived 9 July 2021 at the Wayback Machine
• Mekong Watch
• Countries of the Mekong River: The Greater Mekong Subregion Asian Development Bank
• Rivers Network : Mekong river blog Archived 5 November 2018 at the Wayback Machine

The Indochina mangroves are a large mangrove ecoregion on the coasts of Thailand, Cambodia, Vietnam and Malaysia in Southeast Asia.

The Indochina mangroves are a large mangrove ecoregion on the coasts of Thailand, Cambodia, Vietnam and Malaysia in Southeast Asia.

Cambodia, officially the Kingdom of Cambodia, is a country in Mainland Southeast Asia. Cambodia borders Thailand to the northwest, Laos to the north, Vietnam to the east, and has a coastline along the Gulf of Thailand on the southwest. Cambodia spans an area of 181,035 square kilometres (69,898 square miles), and has a population of about 17 million. Its capital and most populous city is Phnom Penh.

In 802 AD, Jayavarman II declared himself king, uniting the warring Khmer princes of Chenla under the name "Kambuja". This marked the beginning of the Khmer Empire. The Indianised kingdom facilitated the spread of first Hinduism and then Buddhism to Southeast Asia and undertook religious infrastructural projects throughout the region. In the fifteenth century, Cambodia experienced a decline of power, and in 1863, it became a protectorate of France. After a period of Japanese occupation during the Second World War, Cambodia gained independence in 1953. The Vietnam War extended into the country in 1965 via the Ho Chi Minh and Sihanouk trails. A 1970 coup installed the US-aligned Khmer Republic, which was overthrown by the Khmer Rouge in 1975. The Khmer Rouge ruled the country and carried out the Cambodian genocide from 1975 until 1979, when they were ousted in the Cambodian–Vietnamese War. The Vietnamese-occupied People's Republic of Kampuchea became the de facto government. Following the 1991 Paris Peace Accords which formally ended the war with Vietnam, Cambodia was governed by a United Nations mission (1992–93). The UN withdrew after holding elections in which around 90% of the registered voters cast ballots. The 1997 coup d'état consolidated power under Prime Minister Hun Sen and the Cambodian People's Party (CPP). While constitutionally a multi-party state, CPP dominates the political system and dissolved its main opposition party in 2017, making Cambodia a de facto one-party state.

The United Nations designates Cambodia as a least developed country. Cambodia is a member of the United Nations, ASEAN, the RCEP, the East Asia Summit, the WTO, the Non-Aligned Movement and La Francophonie. Cambodia is a dialogue partner of the Shanghai Cooperation Organisation. Agriculture remains the dominant economic sector, with growth in textiles, construction, garments, and tourism leading to increased foreign investment and international trade. Cambodia is considered among the most vulnerable countries to climate change.

The Kingdom of Cambodia is the official English name of the country. The English Cambodia is an anglicisation of the French Cambodge, which in turn is the French transliteration of the Khmer កម្ពុជា (Kâmpŭchéa, pronounced [kampuciə]). Kâmpŭchéa is the shortened alternative to the country's official name in Khmer ព្រះរាជាណាចក្រកម្ពុជា (Preăh Réachéanachâkr Kâmpŭchéa, pronounced [preah riəciənaːcak kampuciə]. The Khmer endonym កម្ពុជា Kâmpŭchéa derives from the Sanskrit name कम्बोजदेश Kambojadeśa, composed of देश Deśa ("land of" or "country of") and कम्बोज (Kamboja), referring to the descendants of Kambu (a legendary Indian sage from the ancient Indian kingdom of Kamboja). The term Cambodia was already in use in Europe as early as 1524, since Antonio Pigafetta cites it in his work Relazione del primo viaggio intorno al mondo (1524–1525) as Camogia.

Scholar George Coedes refers to a 10th-century inscription of a Cambodian dynastic legend in which the hermit Kambu Swayambhuva and the celestial nymph Mera unite and establish the Cambodian Solar royal dynasty (Kambu-Mera), that begins with the Chenla ruler Srutavarman and his son Sreshthavarman. Coedes suggests that the Kambu Swayambhuva legend has its origins in southern India, as a version of the Kanchi Pallava dynasty creation myth.

Colloquially, Cambodians refer to their country as either Srok Khmer (ស្រុកខ្មែរ Srŏk Khmêr, pronounced [srok kʰmae]; meaning "Land of the Khmers"), or the slightly more formal ប្រទេសកម្ពុជា (Prâtés Kâmpŭchéa, pronounced [prɑteh kampuciə]; "Country of Kampuchea"). The name Cambodia is used most often in the Western world while Kampuchea is more widely used in the Eastern world.

There exists evidence for a Pleistocene human occupation of what later is Cambodia, which includes quartz and quartzite pebble tools found in terraces along the Mekong River, in Stung Treng and Kratié provinces, and in Kampot Province. Some archaeological evidence shows communities of hunter-gatherers inhabited the region during Holocene: the most ancient archaeological discovery site in Cambodia is considered to be the cave of Laang Spean, which belongs to the Hoabinhian period. Excavations in its lower layers produced a series of radiocarbon dates around 6000 BC. Upper layers in the same site gave evidence of transition to Neolithic, containing the earliest dated earthenware ceramics in Cambodia.

Archaeological records for the period between Holocene and Iron Age remain equally limited. An event in prehistory was the penetration of the first rice farmers from the north, which began in the third millennium BC. Prehistoric evidence are the "circular earthworks" discovered in the red soils near Memot and in the adjacent region of Vietnam in the latter 1950s. Their function and age are still debated, and some of them possibly date from second millennium BC. Other prehistoric sites of somewhat uncertain date are Samrong Sen (not far from the ancient capital of Oudong), where the first investigations began in 1875, and Phum Snay, in the northern province of Banteay Meanchey.

Iron was worked by about 500 BC, with supporting evidence coming from the Khorat Plateau, in what later is Thailand. In Cambodia, some Iron Age settlements were found beneath Baksei Chamkrong and other Angkorian temples while circular earthworks at the site of Lovea kilometres north-west of Angkor. Burials testify to improvement of food availability and trade, and the existence of a social structure and labour organization. Kinds of glass beads recovered from sites, such as the Phum Snay site in the northwest and the Prohear site in the southeast, suggest that there were 2 main trading networks at the time. The 2 networks were separated by time and space, which indicate that there was a shift from 1 network to the other at about 2nd–4th century AD, probably due to changes in socio-political powers.

During the 3rd, 4th, and 5th centuries, the Indianised states of Funan and its successor, Chenla, coalesced in what later is Cambodia and southwestern Vietnam. For more than 2,000 years, what was to become Cambodia absorbed influences from India, passing them on to other Southeast Asian civilisations that later are Thailand and Laos.

The Khmer Empire grew out of the remnants of Chenla, becoming firmly established in 802 when Jayavarman II (reigned c. 790 – c. 835) declared independence from Java and proclaimed themselves a Devaraja. They and their followers instituted the cult of the God-king and began a series of conquests that formed an empire which flourished in the area from the 9th to the 15th centuries. During the rule of Jayavarman VIII the Angkor empire was attacked by the Mongol army of Kublai Khan, the king was able to buy peace. Around the 13th century, Theravada missionaries from Sri Lanka reintroduced Theravada Buddhism to Southeast Asia; having sent missionaries previously in 1190s. The religion spread and eventually displaced Hinduism and Mahayana Buddhism as the popular religion of Angkor; it was not the official state religion until 1295 when Indravarman III took power.

The Khmer Empire was Southeast Asia's largest empire during the 12th century. The empire's centre of power was Angkor, where a series of capitals were constructed during the empire's zenith. In 2007 an international team of researchers using satellite photographs and other modern techniques concluded that Angkor had been the largest pre-industrial city in the world with an urban sprawl of 2,980 square kilometres (1,151 square miles). The city could have supported a population of up to 1 million people.

After a series of wars with neighbouring kingdoms, Angkor was sacked by the Ayutthaya Kingdom and abandoned in 1432 because of ecological failure and infrastructure breakdown.

The hill tribe people were "hunted incessantly and carried off as slaves by the Siamese (Thai), the Annamites (Vietnamese), and the Cambodians".

Formerly part of the Khmer Empire, the Mekong Delta had been controlled by the Vietnamese since 1698, with King Chey Chettha II granting the Vietnamese permission to settle in the area decades before.

In 1863, King Norodom was installed by Siam.

Cambodia continued as a protectorate of France from 1867 to 1953, administered as part of the colony of French Indochina, while occupied by the Japanese empire from 1941 to 1945. and existing as the puppet state of Kingdom of Kampuchea in 1945. Between 1874 and 1962, the total population increased from about 946,000 to 5.7 million. After King Norodom's death in 1904, France manipulated the choice of king, and Sisowath, Norodom's brother, was placed on the throne. The throne became vacant in 1941 with the death of Monivong, Sisowath's son, and France passed over Monivong's son, Monireth, feeling he was too independently minded. Instead, Norodom Sihanouk, a maternal grandson of King Sisowath was enthroned. The French thought young Sihanouk would be easy to control. Under the reign of King Norodom Sihanouk, Cambodia gained independence from France on 9 November 1953.

In 1955, Sihanouk abdicated in favour of his father to participate in politics and was elected prime minister. Upon his father's death in 1960, Sihanouk again became head of state, taking the title of prince. As the Vietnam War progressed, Sihanouk adopted an official policy of neutrality in the Cold War. Sihanouk allowed the Vietnamese communists to use Cambodia as a sanctuary and a supply route for their arms and other aid to their armed forces fighting in South Vietnam. In December 1967 Washington Post journalist Stanley Karnow was told by Sihanouk that if the US wanted to bomb the Vietnamese communist sanctuaries, he would not object unless Cambodians were killed.

The same message was conveyed to US President Johnson's emissary Chester Bowles in January 1968. In public Sihanouk refuted the right of the U.S. to use air strikes in Cambodia, and on 26 March he said "these criminal attacks must immediately and definitively stop". On 28 March a press conference was held and Sihanouk appealed to the international media: "I appeal to you to publicise abroad this very clear stand of Cambodia—that is, I will, in any case, oppose all bombings on Cambodian territory under whatever pretext." Nevertheless, the public pleas of Sihanouk were ignored and the bombing continued.

While visiting Beijing in 1970 Sihanouk was ousted by a military coup led by Prime Minister General Lon Nol and Prince Sisowath Sirik Matak. Once the coup was completed, the new regime, which demanded that the Vietnamese communists leave Cambodia, gained the political support of the United States. The North Vietnamese and Viet Cong forces, desperate to retain their sanctuaries and supply lines from North Vietnam, launched armed attacks on the new government. The king urged his followers to help in overthrowing this government, hastening the onset of civil war.

Khmer Rouge rebels began using him to gain support. From 1970 until 1972, the Cambodian conflict was largely between the government and army of Cambodia, and the armed forces of North Vietnam. As they gained control of Cambodian territory, the Vietnamese communists imposed a new political infrastructure, which was eventually dominated by the Cambodian communists now referred to as the Khmer Rouge.

Documents uncovered from the Soviet archives after 1991 reveal that the North Vietnamese attempt to overrun Cambodia in 1970 was launched at the explicit request of the Khmer Rouge and negotiated by Pol Pot's then second in command, Nuon Chea. NVA units overran Cambodian army positions while the Communist Party of Kampuchea (CPK) expanded their attacks on lines of communication. In response to the North Vietnamese invasion, US President Richard Nixon announced that US and South Vietnamese ground forces had entered Cambodia in a campaign aimed at destroying NVA base areas in Cambodia (see Cambodian Incursion).

On New Year's Day 1975, Communist troops launched an offensive which, in 117 days, led to the collapse of the Khmer Republic. Simultaneous attacks around the perimeter of Phnom Penh pinned down Republican forces, while other CPK units overran fire bases controlling the vital lower Mekong resupply route. A US-funded airlift of ammunition and rice ended when Congress refused additional aid for Cambodia. The Lon Nol government in Phnom Penh surrendered on 17 April 1975, 5 days after the US mission evacuated Cambodia.

Estimates as to how many people were killed by the Khmer Rouge regime range from approximately 1 to 3 million; a cited figure is 2 million (about a quarter of the population). This era gave rise to the term Killing Fields, and the prison Tuol Sleng became known for its history of mass killing. Hundreds of thousands fled across the border into neighbouring Thailand. The regime disproportionately targeted ethnic minority groups. The Cham Muslims underwent purges with as much as half of their population exterminated. Pol Pot was determined to keep his power and disenfranchise any enemies or potential threats, and thus increased his violent and aggressive actions against his people.

Forced repatriation in 1970 and deaths during the Khmer Rouge era reduced the Vietnamese population in Cambodia from between 250,000 and 300,000 in 1969 to a reported 56,000 in 1984. Most of the victims of the Khmer Rouge regime were not ethnic minorities but ethnic Khmer. Professionals, such as doctors, lawyers and teachers, were targeted. According to Robert D. Kaplan, "eyeglasses were as deadly as the yellow star" as they were seen as a sign of intellectualism.

Religious institutions were targeted by the Khmer Rouge. The majority of Khmer architecture, 95% of Cambodia's Buddhist temples, were destroyed.

In November 1978, Vietnamese troops invaded Cambodia in response to border raids by the Khmer Rouge and conquered it. The People's Republic of Kampuchea (PRK) was established as a pro-Soviet state led by the Kampuchean People's Revolutionary Party, a party created by the Vietnamese in 1951, and led by a group of Khmer Rouge who had fled Cambodia to avoid being purged by Pol Pot and Ta Mok. It was fully beholden to the occupying Vietnamese army and under the direction of the Vietnamese ambassador to Phnom Penh. Its arms came from Vietnam and the Soviet Union.

In opposition to the newly created state, a government-in-exile referred to as the Coalition Government of Democratic Kampuchea (CGDK) was formed in 1981 from 3 factions. This consisted of the Khmer Rouge, a royalist faction led by Sihanouk, and the Khmer People's National Liberation Front. Its credentials were recognised by the United Nations. The Khmer Rouge representative to UN, Thiounn Prasith, was retained, and he had to work in consultation with representatives of the noncommunist Cambodian parties. The refusal of Vietnam to withdraw from Cambodia led to economic sanctions.

Peace efforts began in Paris in 1989 under the State of Cambodia, culminating 2 years later in October 1991 in a Paris Comprehensive Peace Settlement. The UN was given a mandate to enforce a ceasefire and deal with refugees and disarmament known as the United Nations Transitional Authority in Cambodia (UNTAC).

In 1993, the monarchy was restored with Norodom Sihanouk reinstated as King, and the first post-war election was coordinated by UNTAC. The election was won by FUNCINPEC led by Sihanouk's son Ranariddh in a hung parliament. A power-sharing agreement was agreed with Ranariddh and Hun Sen of the Cambodian People's Party both simultaneously being co-Prime Ministers after the CPP threatened to secede part of the country if power was fully transferred to FUNCINPEC. The stability established following the conflict was shaken in 1997 by a coup d'état led by the co-Prime Minister Hun Sen, who ousted Ranariddh and other parties represented in the government and consolidated power for CPP. After its government was able to stabilize under Sen, Cambodia was accepted into the Association of Southeast Asian Nations (ASEAN) on 30 April 1999. Norodom Sihamoni was crowned Cambodia's king in 2004 after his father Sihanouk's abdication.

During the late 1990s and early 2000s, reconstruction efforts progressed which led to some political stability through a multiparty democracy under a constitutional monarchy although Sen's rule has been marred by human rights abuses and corruption. Cambodia's economy grew rapidly in the 2000s and 2010s, and it received considerable investment and infrastructure development support from China as part of its Belt and Road Initiative.

A UN-backed war crimes tribunal, the Khmer Rouge Tribunal sought out to investigate crimes committed during the Democratic Kampuchea period and prosecute its leaders. However, Hun Sen has opposed extensive trials or investigations of former Khmer Rouge officials. In July 2010, Kang Kek Iew was the first Khmer Rouge member found guilty of war crimes and crimes against humanity in his role as the former commandant of the S21 extermination camp and he was sentenced to life in prison. In August 2014, the tribunal sentenced Khieu Samphan, the regime's 83-year-old former head of state, and Nuon Chea, its 88-year-old chief ideologue, to life in prison on war crimes charges for their role in the country's terror period in the 1970s.

After the 2013 Cambodian general election, allegations of voter fraud from opposition party Cambodia National Rescue Party led to widespread anti-government protests that continued into the following year. The protests ended after a crackdown by government forces. The Cambodia National Rescue Party was dissolved ahead of the 2018 Cambodian general election and the ruling Cambodian People's Party also enacted tighter curbs on mass media. The CPP won every seat in the National Assembly without major opposition, effectively solidifying de facto one-party rule in the country.

The global COVID-19 pandemic spread to Cambodia in early 2020. Despite minimising the disease's spread for much of 2020 the country's health system was put under strain by a major outbreak in early 2021, which prompted several lockdowns. It also had a severe economic impact, with the tourism industry particularly affected due to international travel restrictions.

Prime Minister Hun Sen assumed office 39 years ago and is one of the world's longest-serving leaders. He has been accused of crackdowns on opponents and critics. In December 2021, Hun Sen announced his support for his son Hun Manet to succeed him after the next general election in 2023. In October 2022, Hun Sen warned CPP members that the country's newest and largest opposition party, the Candlelight Party, may be dissolved before the 2023 general election. The warning comes after a June 2022 lawsuit filed by the National Election Committee against the party's deputy president, Son Chhay, accusing him of defamation by speaking out against electoral fraud by the CPP.

A July 2023 Human Rights Watch report showed numerous and significant election fraud and vote tampering in the June 2022 commune elections.

In the July 2023 election, the ruling Cambodian People's Party (CPP) easily won by a landslide in a flawed election, after the disqualification of Cambodia's most important opposition, Candlelight Party. On 22 August 2023, Hun Manet was sworn in as the new Cambodian prime minister.

Cambodia has an area of 181,035 square kilometres (69,898 square miles) and lies entirely within the tropics, between latitudes 10° and 15°N, and longitudes 102° and 108°E. It borders Thailand to the north and west, Laos to the northeast, and Vietnam to the east and southeast. It has a 443-kilometre (275-mile) coastline along the Gulf of Thailand.

Cambodia's landscape is characterised by a low-lying central plain that is surrounded by uplands and low mountains and includes the Tonle Sap (Great Lake) and the upper reaches of the Mekong River delta. Extending outward from this central region are transitional plains, thinly forested and rising to elevations of about 650 feet (200 metres) above sea level.

To the north the Cambodian plain abuts a sandstone escarpment, which forms a southward-facing cliff stretching more than 200 miles (320 kilometres) from west to east and rising abruptly above the plain to heights of 600 to 1,800 feet (180–550 metres). This cliff marks the southern limit of the Dângrêk Mountains.

Flowing south through Cambodia's eastern regions is the Mekong River. East of the Mekong the transitional plains gradually merge with the eastern highlands, a region of forested mountains and high plateaus that extend into Laos and Vietnam. In southwestern Cambodia two distinct upland blocks, the Krâvanh Mountains and the Dâmrei Mountains, form another highland region that covers much of the land area between the Tonle Sap and the Gulf of Thailand.

In this remote and largely uninhabited area, Phnom Aural, Cambodia's highest peak rises to an elevation of 5,949 feet (1,813 metres). The southern coastal region adjoining the Gulf of Thailand is a narrow lowland strip, heavily wooded and sparsely populated, which is isolated from the central plain by the southwestern highlands.

The most distinctive geographical feature is the inundations of the Tonle Sap, measuring about 2,590 square kilometres (1,000 square miles) during the dry season and expanding to about 24,605 square kilometres (9,500 square miles) during the rainy season. This densely populated plain, which is devoted to wet rice cultivation, is the heartland of Cambodia. Much of this area has been designated as a biosphere reserve.

Cambodia's climate, like that of the rest of Southeast Asia, is dominated by monsoons, which are known as tropical wet and dry because of the distinctly marked seasonal differences.

Cambodia has a temperature range from 21 to 35 °C (70 to 95 °F) and experiences tropical monsoons. Southwest monsoons blow inland bringing moisture-laden winds from the Gulf of Thailand and Indian Ocean from May to October. The northeast monsoon ushers in the dry season, which lasts from November to April. The country experiences the heaviest precipitation from September to October with the driest period occurring from January to February.

According to the International Development Research Center and The United Nations, Cambodia is considered Southeast Asia's most vulnerable country to the effects of climate change, alongside the Philippines. Nearly all provinces in Cambodia are affected by climate change. Rural coastal populations are particularly at risk. Shortages of clean water, extreme flooding, mudslides, higher sea levels and potentially destructive storms are of particular concern, according to the Cambodia Climate Change Alliance. Climate change has also had a major impact on water levels, ecology and productivity of the Tonlé Sap in recent years, affecting the food security and agriculture of a large proportion of Cambodia's population.

Cambodia has two distinct seasons. The rainy season, which runs from May to October, can see temperatures drop to 22 °C (72 °F) and is generally accompanied with high humidity. The dry season lasts from November to April when temperatures can rise up to 40 °C (104 °F) around April. Disastrous flooding occurred in 2001 and again in 2002, with some degree of flooding almost every year. Severe flooding also affected 17 provinces in Cambodia during the 2020 Pacific typhoon season.

Cambodia's biodiversity is largely founded on its seasonal tropical forests, containing some 180 recorded tree species, and riparian ecosystems. There are 212 mammal species, 536 bird species, 240 reptile species, 850 freshwater fish species (Tonle Sap Lake area), and 435 marine fish species recorded by science. Much of this biodiversity is contained around the Tonle Sap Lake and the surrounding biosphere.

The Tonle Sap Biosphere Reserve is a reserve surrounding the Tonle Sap lake. It encompasses the lake and nine provinces: Kampong Thom, Siem Reap, Battambang, Pursat, Kampong Chhnang, Banteay Meanchey, Pailin, Oddar Meanchey and Preah Vihear. In 1997, it was successfully nominated as a UNESCO Biosphere Reserve. Other key habitats include the evergreen and dry Dipterocarp forests of Mondolkiri province, protected by Keo Seima Wildlife Sanctuary, Phnom Prich Wildlife Sanctuary, and Srepok Wildlife Sanctuary, as well as Ratanakiri province, and the Cardamom Mountains ecosystem, including Preah Monivong National Park, Botum-Sakor National Park, and the Phnom Aural Wildlife Sanctuary and Phnom Samkos Wildlife Sanctuary.

The Worldwide Fund for Nature recognises six distinct terrestrial ecoregions in Cambodia – the Cardamom Mountains rain forests, Central Indochina dry forest, Southeast Indochina dry evergreen forest, Southern Annamite Range tropical forest, Tonle Sap freshwater swamp forest, and Tonle Sap-Mekong peat swamp forest.

The rate of deforestation in Cambodia is one of the highest in the world and it is often perceived as the most destructive, singular environmental issue in the country. Cambodia's primary forest cover fell from over 70% in 1969 to just 3.1% in 2007. Since 2007, less than 3,220 km² (1,243 sq mi) of primary forest remain with the result that the future sustainability of the forest reserves of Cambodia is under severe threat. In 2010–2015, the annual rate of deforestation was 1.3%. The environmental degradation also includes national parks and wildlife sanctuaries on a large scale and many endangered and endemic species are now threatened with extinction due to loss of habitats. Reasons for the deforestation in Cambodia range from opportunistic illegal loggings to large scale clearings from big construction projects and agricultural activities. The deforestation involves the local population, Cambodian businesses and authorities as well as transnational corporations from all over the world.

Plans for hydroelectric development in the Greater Mekong Subregion, by Laos in particular, pose a "real danger to the food supply of Vietnam and Cambodia. Upstream dams will imperil the fish stocks that provide the vast majority of Cambodia's protein and could also denude the Mekong River of the silt Vietnam needs for its rice basket." The rich fisheries of Tonle Sap, the largest freshwater lake in Southeast Asia, largely supply the impoverished country's protein. The lake is unusual: It all but disappears in the dry season and then expands massively as water flow from the Mekong backs up when the rains come. "Those fish are so important for their livelihoods, both economically and nutritionally", said Gordon Holtgrieve, a professor at the University of Washington; he points out that none of the dams that are either built or being built on the Mekong river "are pointing at good outcomes for the fisheries".

In the 2010s, the Cambodian government and educational system has increased its involvement and co-operation with both national and international environmental groups. A new National Environmental Strategy and Action Plan (NESAP) for Cambodia is to be implemented from late 2016 to 2023 and contains new ideas for how to incite a green and environmentally sustainable growth for the country.

National politics in Cambodia take place within the framework of the nation's constitution of 1993. The government is a constitutional monarchy operated as a parliamentary representative democracy. The Prime Minister of Cambodia, currently Hun Manet, is the head of government, while the King of Cambodia (currently Norodom Sihamoni) is the head of state. The prime minister is appointed by the king, on the advice and with the approval of the National Assembly. The prime minister and the ministerial appointees exercise executive power.

Legislative powers are shared by the executive and the bicameral Parliament of Cambodia (សភាតំណាងរាស្ត្រ, sâphéa tâmnang réastrâ), which consists of a lower house, the National Assembly (រដ្ឋសភា, rôdthâsâphéa) and an upper house, the Senate (ព្រឹទ្ធសភា, prœ̆tthôsâphéa). Members of the 123-seat National Assembly are elected through a system of proportional representation and serve for a maximum term of five years. The Senate has 61 seats, two of which are appointed by the king and two others by the National Assembly, and the rest elected by the commune councillors from the 24 provinces of Cambodia. Senators serve six-year terms.

On 14 October 2004, King Norodom Sihamoni was selected by a special nine-member Royal Throne Council, part of a selection process that was quickly put in place after the abdication of King Norodom Sihanouk a week prior. Sihamoni's selection was endorsed by Prime Minister Hun Sen and National Assembly Speaker Prince Norodom Ranariddh (the king's half-brother and current chief advisor), both members of the throne council. He was enthroned in Phnom Penh on 29 October 2004.

Officially a multiparty democracy, in reality, "the country remain[ed] a one-party state dominated by the Cambodian People's Party and Prime Minister Hun Sen, a recast Khmer Rouge official in power since 1985. The open doors to new investment during his reign have yielded the most access to a coterie of cronies of his and his wife, Bun Rany", according to Megha Bahree, a writer on Forbes. Cambodia's government has been described by Human Rights Watch's Southeast Asian director, David Roberts, as a "relatively authoritarian coalition via a superficial democracy".

Prime Minister Hun Sen vowed to rule until he turned 74. His government was regularly accused of ignoring human rights and suppressing political dissent. The 2013 election results were disputed by the opposition, leading to demonstrations in the capital. Demonstrators were injured and killed in Phnom Penh where a reported 20,000 protesters gathered, with some clashing with riot police. From a humble farming background, Hun Sen was just 33 when he took power in 1985, and was by some considered a long-ruling dictator. Hun Sen was succeeded by his son Hun Manet as Prime Minister in August 2023 following an election that was deemed by independent and foreign media and politicians to be neither free nor fair. Hun Sen remains the de facto ruler of Cambodia through his continued leadership of the Cambodian People's Party. Following the 2024 Senate election, Hun Sen became president of the Senate, a role which gives him the power to sign off on laws in the King's absence.

Since the 2017 crackdowns on political dissent and free press, Cambodia has been described as a de facto one-party state.

The foreign relations of Cambodia are handled by the Ministry of Foreign Affairs under Prak Sokhon. Cambodia is a member of the United Nations, the World Bank, and the International Monetary Fund. It is a member of the Asian Development Bank (ADB), ASEAN, and joined the WTO in 2004. In 2005 Cambodia attended the inaugural East Asia Summit in Malaysia.

Cambodia has established diplomatic relations with numerous countries; the government reports twenty embassies in the country including many of its Asian neighbours and those of important players during the Paris peace negotiations, including the US, Australia, Canada, China, the European Union (EU), Japan, and Russia. As a result of its international relations, various charitable organisations have assisted with social, economic, and civil infrastructure needs.

While the violent ruptures of the 1970s and 1980s have passed, several border disputes between Cambodia and its neighbours persist. There are disagreements over some offshore islands and sections of the boundary with Vietnam and undefined maritime boundaries. Cambodia and Thailand also have border disputes, with troops clashing over land immediately adjacent to the Preah Vihear temple in particular, leading to a deterioration in relations. Most of the territory belongs to Cambodia, but a combination of Thailand disrespecting international law, Thai troops upbuild in the area and lack of resources for the Cambodian military have left the situation unsettled since 1962.

Cambodia and China have cultivated ties in the 2010s. A Chinese company with the support of the People's Liberation Army built a deep-water seaport along 90 km (56 mi) stretch of Cambodian coastline of the Gulf of Thailand in Koh Kong province; the port is sufficiently deep to be used by cruise ships, bulk carriers or warships. Cambodia's diplomatic support has been invaluable to Beijing's effort to claim disputed areas in the South China Sea. Because Cambodia is a member of ASEAN, and because under ASEAN rules "the objections of one member can thwart any group initiative", Cambodia is diplomatically useful to China as a counterweight to southeast Asian nations that have closer ties to the United States.

The Royal Cambodian Army, Royal Cambodian Navy, Royal Cambodian Air Force and Royal Gendarmerie collectively form the Royal Cambodian Armed Forces, under the command of the Ministry of National Defence, presided over by the Prime Minister of Cambodia. His Majesty King Norodom Sihamoni is the Supreme Commander of the Royal Cambodian Armed Forces (RCAF), and the country's Prime Minister Hun Sen effectively holds the position of commander-in-chief.

The introduction of a revised command structure early in 2000 was a key prelude to the reorganisation of the Cambodian military. This saw the defence ministry form three subordinate general departments responsible for logistics and finance, materials and technical services, and defence services under the High Command Headquarters (HCHQ). The minister of National Defense is General Tea Banh. The Secretaries of State for Defense are Chay Saing Yun and Por Bun Sreu.

In 2010, the Royal Cambodian Armed Forces comprised about 102,000 active personnel (200,000 reserve). Total Cambodian military spending stands at 3% of national GDP. The Royal Gendarmerie of Cambodia total more than 7,000 personnel. Its civil duties include providing security and public peace, to investigate and prevent organised crime, terrorism, and other violent groups; to protect state and private property; to help and assist civilians and other emergency forces in a case of emergency, natural disaster, civil unrest, and armed conflicts.

Hun Sen has accumulated highly centralised power in Cambodia, including a praetorian guard that 'appears to rival the capabilities of the country's regular military units', and is allegedly used by Hun Sen to quell political opposition.' Cambodia signed the UN treaty on the Prohibition of Nuclear Weapons.

The Cambodian People's Party (CPP) is the sole dominant-party in Cambodia. The CPP currently commands 120 of the 125 seats in the National Assembly and 55 of 62 seats in the Senate.

Hun Sen and his government have seen much controversy. Hun Sen was a former Khmer Rouge commander who was originally installed by the Vietnamese and, after the Vietnamese left the country, maintains his strong man position by violence and oppression when deemed necessary. In 1997, fearing the growing power of his co-prime minister, Prince Norodom Ranariddh, Hun launched a coup, using the army to purge Ranariddh and his supporters. Ranariddh was ousted and fled to Paris while other opponents of Hun Sen were arrested, tortured, and some summarily executed.

In addition to political oppression, the Cambodian government has been accused of corruption in the sale of vast areas of land to foreign investors resulting in the eviction of thousands of villagers as well as taking bribes in exchange for grants to exploit Cambodia's oil wealth and mineral resources. Cambodia is consistently listed as one of the most corrupt governments in the world. Amnesty International currently recognises one prisoner of conscience in the country: 33-year-old land rights activist Yorm Bopha.

Journalists covering a protest over disputed election results in Phnom Penh on 22 September 2013 say they were deliberately attacked by police and men in plain clothes, with slingshots and stun guns. The attack against the president of the Overseas Press Club of Cambodia, Rick Valenzuela, was captured on video.The violence came amid political tensions as the opposition boycotted the opening of Parliament due to concerns about electoral fraud. Seven reporters sustained minor injuries while at least two Cambodian protesters were hit by slingshot projectiles and hospitalized.

In 2017, Cambodia's Supreme Court dissolved the main opposition party, Cambodia National Rescue Party (CNRP), paving the way for a return to a yet more authoritarian political system.

The level of corruption in Cambodia exceeds most countries in the world. Despite adopting an 'Anti-Corruption Law' in 2010, corruption prevails throughout the country. Corruption affects the judiciary, the police, and other state institutions. Favouritism by government officials and impunity is commonplace. Lack of a clear distinction between the courts and the executive branch of government also makes for a deep politicisation of the judicial system.

Examples of areas where Cambodians encounter corrupt practices in their everyday lives include obtaining medical services, dealing with alleged traffic violations, and pursuing fair court verdicts. Companies deal with extensive red tape when obtaining licenses and permits, especially construction-related permits, and the demand for and supply of bribes are commonplace in this process. The 2010 Anti-Corruption Law provided no protection to whistle-blowers, and whistle-blowers can be jailed for up to 6 months if they report corruption that cannot be proven.

The Cambodian legal profession was established in 1932. By 1978, due to the Khmer Rouge regime, the entire legal system was eradicated. Judges and lawyers were executed after being deemed "class enemies" and only 6–12 legal professionals actually survived and remained in the country. Lawyers did not reappear until 1995 when the Bar Association of the Kingdom of Cambodia was created.

A US State Department report says "forces under Hun Sen and the Cambodian People's Party have committed frequent and large-scale abuses, including extrajudicial killings and torture, with impunity". According to the 2016 Global Slavery Index, an estimated 256,800 people are enslaved in modern-day Cambodia, or 1.65% of the population.

Forced land evictions by senior officials, security forces, and government-connected business leaders are commonplace in Cambodia. Land has been confiscated from hundreds of thousands of Cambodians over more than a decade for the purpose of self-enrichment and maintaining power of various groups of special interests. Credible non-governmental organisations estimate that "770,000 people have been adversely affected by land grabbing covering at least four million hectares (nearly 10 million acres) of land that have been confiscated", says Paris-based International Federation for Human Rights (FIDH).

On 14 March 2018, the UN expert on the human rights situation in Cambodia "expressed serious concerns about restrictions on the media, freedom of expression and political participation ahead of a national election in July". Some critics of the government have been arrested for allegedly spreading fake news about the COVID-19 pandemic in Cambodia.

The autonomous municipality (reach thani) and provinces (khaet) of Cambodia are first-level administrative divisions. Cambodia is divided into 25 provinces including the autonomous municipality.

Municipalities and districts are the second-level administrative divisions of Cambodia. The provinces are subdivided into 159 districts and 26 municipalities. The districts and municipalities in turn are further divided into communes (khum) and quarters (sangkat).

In 2017 Cambodia's per capita income is $4,022 in PPP and $1,309 in nominal per capita. The United Nations designates Cambodia as a least developed country. Most rural households depend on agriculture and its related sub-sectors. Rice, fish, timber, garments, and rubber are Cambodia's major exports. The International Rice Research Institute (IRRI) reintroduced more than 750 traditional rice varieties to Cambodia from its rice seed bank in the Philippines. These varieties had been collected in the 1960s.

Based on the Economist, IMF: Annual average GDP growth for the period 2001–2010 was 7.7% making it one of the world's top ten countries with the highest annual average GDP growth. Tourism was Cambodia's fastest-growing industry, with arrivals increasing from 219,000 in 1997 to over 2 million in 2007. In 2004, inflation was at 1.7% and exports at US$1.6 billion.

Oil and natural gas deposits found beneath Cambodia's territorial waters in 2005 yield great potential but remain mostly untapped, due in part to territorial disputes with Thailand.

The National Bank of Cambodia is the central bank of the kingdom and provides regulatory oversight to the country's banking sector and is responsible in part for increasing the foreign direct investment in the country. Between 2010 and 2012 the number of regulated banks and micro-finance institutions increased from 31 covered entities to over 70 individual institutions underlining the growth within the Cambodian banking and finance sector.

In 2012, Credit Bureau Cambodia was established with direct regulatory oversight by the National Bank of Cambodia. The Credit Bureau further increases the transparency and stability within the Cambodian Banking Sector as all banks and microfinance companies are now required by law to report accurate facts and figures relating to loan performance in the country.

One of the largest challenges facing Cambodia is still the fact that the older population often lacks education, particularly in the countryside, which suffers from a lack of basic infrastructure. Fear of renewed political instability and corruption within the government discourage foreign investment and delay foreign aid, although there has been significant aid from bilateral and multilateral donors. Donors pledged $504 million to the country in 2004, while the Asian Development Bank alone has provided $850 million in loans, grants, and technical assistance. Bribes are often demanded from companies operating in Cambodia when obtaining licences and permits, such as construction-related permits.

Cambodia ranked among the worst places in the world for organised labour in the 2015 International Trade Union Confederation (ITUC) Global Rights Index, landing in the category of countries with "no guarantee of rights".'

In April 2016 Cambodia's National Assembly has adopted a Law on Trade Unions. "The law was proposed at a time when workers have been staging sustained protests in factories and in the streets demanding wage increases and improvements in their working conditions". The concerns about Cambodia's new law are shared not only by labour and rights groups but international organisations more generally. The International Labour Organization Country Office for Thailand, Cambodia and Lao PDR, has noted that the law has "several key concerns and gaps".

The garment industry represents the largest portion of Cambodia's manufacturing sector, accounting for 80% of the country's exports. In 2012, the exports grew to $4.61 billion up 8% over 2011. In the first half of 2013, the garment industry reported exports worth $1.56 billion. The sector employs 335,400 workers, of which 91% are female.

Better Factories Cambodia was created in 2001 as a unique partnership between the UN's International Labour Organization (ILO) and the International Finance Corporation (IFC), a member of the World Bank Group. The programme engages with workers, employers, and governments to improve working conditions and boost the competitiveness of the garment industry. On 18 May 2018, the Project Advisory Committee (PAC) of the ILO Better Factories Cambodia Programme met in Phnom Penh to provide input into the draft conclusions and recommendations of the BFC's independent mid-term evaluation, as well as to discuss options on how to further strengthen the programme's transparent reporting initiative. The members of the PAC concurred with the findings of the evaluation related to the impact the programme has had on the Cambodian garment sector and workers, including:a. contributing to sustained overall growth of the garment industryb. improving the lives of at least half a million Cambodian workers of factories in the BFCprogramme and many more of their family members;c. ensuring that workers receive correct wages and social protection benefitsd. virtually eliminating child labour in the sectore. making Cambodia's garment factories safer overallf. creating a "level playing field" for labour across garment sectorg. influencing business practices through (1) using factory data to highlight areas forimprovement and (2) being a core part of risk management strategies of internationalbrands/buyers.

The tourism industry is the country's second-greatest source of hard currency after the textile industry. International visitor arrivals in 2018 topped six million, a ten-fold increase since the beginning of the 21st century. Tourism employs 26% of the country's workforce, which translates into roughly 2.5 million jobs for Cambodians.

Besides Phom Penh and Angkor Wat, other tourist destinations include Sihanoukville in the southwest which has several popular beaches and Battambang in the northwest, both of which are popular stops for backpackers who make up a significant portion of visitors to Cambodia. The area around Kampot and Kep including the Bokor Hill Station are also of interest to visitors. Tourism has increased steadily each year in the relatively stable period since the 1993 UNTAC elections.

Most international arrivals in 2018 were Chinese. Tourism receipts exceeded US$4.4 billion in 2018, accounting for almost ten per cent of the kingdom's gross national product. The Angkor Wat historical park in Siem Reap Province, the beaches in Sihanoukville, the capital city Phnom Penh, and Cambodia's 150 casinos (up from just 57 in 2014) are the main attractions for foreign tourists.

Cambodia's reputation as a safe destination for tourism however has been hindered by civil and political unrest and several high-profile examples of serious crime committed against tourists visiting the kingdom.

Cambodia's tourist souvenir industry employs a lot of people around the main places of interest. The quantity of souvenirs that are produced is not sufficient to face the increasing number of tourists and a majority of products sold to the tourists on the markets are imported from China, Thailand, and Vietnam.

Agriculture is the mainstay of the Cambodian economy. Agriculture accounted for 90 per cent of GDP in 1985 and employed approximately 80 per cent of the workforce. Rice is the principal commodity. Major secondary crops include maize, cassava, sweet potatoes, groundnuts, soybeans, sesame seeds, dry beans, and rubber. The principal commercial crop is rubber. In the 1980s it was an important primary commodity, second only to rice, and one of the country's few sources of foreign exchange.

The civil war and neglect severely damaged Cambodia's transport system. With assistance from other countries, Cambodia has been upgrading the main highways to international standards and most are vastly improved from 2006. Most main roads are now paved.

Cambodia has two rail lines, totalling about 612 kilometres (380 miles) of single, one-metre (3-foot-3-inch) gauge track. The lines run from the capital to Sihanoukville on the southern coast. Trains are again running to and from the Cambodian capital and popular destinations in the south. After 14 years, regular rail services between the two cities restarted recently – offering a safer option than road for travellers. Trains also run from Phnom Penh to Sisophon (although trains often run only as far as Battambang). As of 1987, only one passenger train per week operated between Phnom Penh and Battambang but a US$141 million project, funded mostly by the Asian Development Bank, has been started to revitalise the languishing rail system that will "(interlink) Cambodia with major industrial and logistics centers in Bangkok and Ho Chi Minh City".

Besides the main inter-provincial traffic artery connecting Phnom Penh with Sihanoukville, resurfacing a former dirt road with concrete/asphalt and bridging five major river crossings have now permanently connected Phnom Penh with Koh Kong, and hence there is now uninterrupted road access to neighbouring Thailand and its road network.

Cambodia's road traffic accident rate is high by world standards. In 2004, the number of road fatalities per 10,000 vehicles was ten times higher in Cambodia than in the developed world, and the number of road deaths had doubled in the preceding three years.

Cambodia's extensive inland waterways were important historically in international trade. The Mekong and the Tonle Sap River, their numerous tributaries, and the Tonle Sap provided avenues of considerable length, including 3,700 kilometres (2,300 miles) navigable all year by craft drawing 0.6 metres (2.0 feet) and another 282 kilometres (175 miles) navigable to craft drawing 1.8 metres (5.9 feet).

Cambodia has two major ports, Phnom Penh and Sihanoukville, and five minor ones. Phnom Penh, at the junction of the Bassac, the Mekong, and the Tonle Sap Rivers, is the only river port capable of receiving 8,000-ton ships during the wet season and 5,000-ton ships during the dry season.

With increasing economic activity has come an increase in automobile use, though motorcycles still predominate. "Cyclo" (as hand-me-down French) or Cycle rickshaws were popular in 1990s but are increasingly replaced by remorques (carriages attached to motorcycles) and rickshaws imported from India. Cyclos are unique to Cambodia in that the cyclist sits behind the passenger seat.

Cambodia has three commercial airports. In 2018, they handled a record of 10 million passengers. Phnom Penh International Airport is the busiest airport in Cambodia. Siem Reap-Angkor International Airport is the second busiest, and serves the most international flights in and out of Cambodia. Sihanouk International Airport, is in the coastal city of Sihanoukville.

A National Committee for Science and Technology representing 11 ministries has been in place since 1999. Although seven ministries are responsible for the country's 33 public universities, the majority of these institutions come under the umbrella of the Ministry of Education, Youth and Sports.

In 2010, the Ministry of Education, Youth and Sports approved a Policy on Research Development in the Education Sector. This move represented the first step towards a national approach to research and development across the university sector and the application of research for the purposes of national development.

This policy was followed by the country's first National Science and Technology Master Plan 2014–2020. It was officially launched by the Ministry of Planning in December 2014, as the culmination of a two-year process supported by the Korea International Cooperation Agency. The plan makes provision for establishing a science and technology foundation to promote industrial innovation, with a particular focus on agriculture, primary industry and ICTs. Cambodia was ranked 101st in the Global Innovation Index in 2023.

Cambodia has high potential for developing renewable energy resources. Even though the country has not attracted much international investment in renewable energy by 2020, the country serves as a model to learn from for other ASEAN countries in terms of conducting solar power auctions. To attract more investment in renewable energy, the government could improve renewable energy governance, adopt clear targets, develop an effective regulatory framework, improve project bankability and facilitate market entry for international investors. Cambodia is highly vulnerable to the negative effects of climate change and it is advised that the country focuses more on developing renewable energy as part of climate change mitigation measures.

The first official census conducted by the French protectorate of Cambodia was in 1921; however, only men aged 20 to 60 were counted as its purpose was for the collection of taxes. After the 1962 population census was conducted, Cambodia's civil conflicts and instability lead to a 36-year-long gap before the country could have another official census in 1998.

At present, fifty per cent of the Cambodian population is younger than 22 years old. At a 1.04 female to male ratio, Cambodia has the most female-biased sex ratio in the Greater Mekong Subregion. Among the Cambodian population aged over 65, the female to male ratio is 1.6:1.

The total fertility rate in Cambodia was 2.5 children per woman in 2018.The fertility rate was 4.0 children in 2000. Women in urban areas have 2.2 children on average, compared with 3.3 children per woman in rural areas. Fertility is highest in Mondol Kiri and Rattanak Kiri Provinces, where women have an average of 4.5 children, and lowest in Phnom Penh where women have an average of 2.0 children.

The vast majority of Cambodia's population is of ethnic Khmer origin (95.8%) who are speakers of the Khmer language, the country's sole official language. Cambodia's population is largely homogeneous. Its minority groups include Chams (1.8%), Vietnamese (0.5%) and Chinese (0.6%).

The largest ethnic group, the Khmers are indigenous to the lowland Mekong subregion in which they inhabit. The Khmers historically have lived near the lower Mekong River in a contiguous diagonal arc, from where modern-day Thailand, Laos, and Cambodia meet in the northwest, all the way to the mouth of the Mekong River in southeastern Vietnam.

The Vietnamese are the second-largest ethnic minority in Cambodia, with an estimated 16,000 living in provinces concentrated in the southeast of the country adjacent to the Mekong Delta. Although the Vietnamese language has been determined to be a Mon–Khmer language, there are very few cultural connections between the two peoples because the early Khmers were influenced by the Indian cultural sphere while the Vietnamese are part of the Chinese cultural sphere. Ethnic tensions between the Khmer and the Vietnamese can be traced to the Post-Angkor Period (from the 16th to 19th centuries), during which time a nascent Vietnam and Thailand each attempted to vassalise a weakened post-Angkor Cambodia, and effectively dominate all of Indochina.

Chinese Cambodians are approximately 0.6% of the population. Most Chinese are descended from 19th–20th-century settlers who came in search of trade and commerce opportunities during the time of the French protectorate. Most are urban dwellers, engaged primarily in commerce.

The indigenous ethnic groups of the mountains are known collectively as Montagnards or Khmer Loeu, a term meaning "Highland Khmer". They are descended from neolithic migrations of Mon–Khmer speakers via southern China and Austronesian speakers from insular Southeast Asia. Being isolated in the highlands, the various Khmer Loeu groups were not Indianized like their Khmer cousins and consequently are culturally distant from modern Khmers and often from each other, observing many pre-Indian-contact customs and beliefs.

The Cham are descended from the Austronesian people of Champa, a former kingdom on the coast of central and southern present-day Vietnam and former rival to the Khmer Empire. The Cham in Cambodia number under a million and often maintain separate villages in the southeast of the country. Almost all Cham in Cambodia are Muslims.

The Khmer language is a member of the Mon–Khmer subfamily of the Austroasiatic language group. French, once the language of government in Indochina, is still spoken by many older Cambodians, and is also the language of instruction in some schools and universities that are funded by the government of France. There is also a French-language newspaper and some TV channels are available in French. Cambodia is a member of La Francophonie. Cambodian French, a remnant of the country's colonial past, is a dialect found in Cambodia and is sometimes used in government, particularly in court. Since 1993, there has been a growing use of English, which has been replacing French as the main foreign language. English is widely taught in several universities and there is also a significant press in that language, while street signs are now bilingual in Khmer and English. Due to this shift, mostly English is now used in Cambodia's international relationships, and it has replaced French both on Cambodia's stamps and, since 2002, on Cambodian currency.

The Khmer script is derived from the South Indian Pallava script.

Theravada Buddhism is the official religion of Cambodia, practised by more than 95 per cent of the population with an estimated 4,392 monastery temples throughout the country. Cambodian Buddhism is deeply influenced by Hinduism and native animism.

The close interrelationship between spirits and the community, the efficacy of apotropaic and luck-attracting actions and charms, and the possibility of manipulating one's life through contact with spiritual entities such as the "baromey" spirits originates from the native folk religion. Hinduism has left little trace beyond the magical practices of Tantricism and a host of Hindu gods now assimilated into the spirit world (for example, the important neak ta spirit called Yeay Mao is the modern avatar of the Hindu goddess Kali).

Mahayana Buddhism is the religion of the majority of Chinese and Vietnamese in Cambodia. Elements of other religious practices, such as the veneration of folk heroes and ancestors, Confucianism, and Taoism mix with Chinese Buddhism are also practised.

Islam is followed by about 2% of the population and comes in three varieties, two practised by the Cham people and a third by the descendants of Malays, resident in the country for generations. Cambodia's Muslim population is reported to be 80% ethnic Cham.

Cambodian life expectancy was 75 years in 2021, a major improvement since 1995 when the average life expectancy was 55. Health care is offered by both public and private practitioners and research has found that trust in health providers is a key factor in improving the uptake of health care services in rural Cambodia. The government plans to increase the quality of healthcare in the country by raising awareness of HIV/AIDS, malaria, and other diseases.

Cambodia's infant mortality rate has decreased from 86 per 1,000 live births in 1998 to 24 in 2018.

In the province with worst health indicators, Ratanakiri, 22.9% of children die before age five.

Cambodia was once one of the most landmined countries in the world. According to some estimates, unexploded land mines have been responsible for over 60,000 civilian deaths and thousands more maimed or injured since 1970. The number of reported landmine casualties has sharply decreased, from 800 in 2005 to 111 in 2013 (22 dead and 89 injured). Adults that survive landmines often require amputation of one or more limbs and have to resort to begging for survival. Cambodia is expected to be free of land mines by 2025 but the social and economic legacy, including orphans and one in 290 people being an amputee, is expected to affect Cambodia for years to come.

In Cambodia, landmines and exploded ordnance alone have caused 44,630 injuries between 1979 and 2013, according to the Cambodia Mine/UXO Victim Information System.

The Ministry of Education, Youth and Sports is responsible for establishing national policies and guidelines for education in Cambodia. The Cambodian education system is heavily decentralised, with three levels of government, central, provincial, and district – responsible for its management. The constitution of Cambodia promulgates free compulsory education for nine years, guaranteeing the universal right to basic quality education.

The 2019 Cambodian census estimated that 88.5% of the population was literate (91.1% of men and 86.2% of women). Male youth age (15–24 years) have a literacy rate of 89% compared to 86% for females.

The education system in Cambodia continues to face many challenges, but during the past years, there have been significant improvements, especially in terms of primary net enrolment gains, the introduction of program based-budgeting, and the development of a policy framework which helps disadvantaged children to gain access to education. The country has also significantly invested in vocational education, especially in rural areas, to tackle poverty and unemployment. Two of Cambodia's most acclaimed universities are based in Phnom Penh.

Traditionally, education in Cambodia was offered by the wats (Buddhist temples), thus providing education exclusively for the male population. During the Khmer Rouge regime, education suffered significant setbacks. Education has also suffered setbacks from child labour, A study by Kim (2011) reports that most employed children in Cambodia are enrolled in school but their employment is associated with late school entry, negative impacts on their learning outcomes, and increased drop out rates. With respect to academic performance among Cambodian primary school children, research showed that parental attitudes and beliefs played a significant role.

In 2017, Cambodia had a homicide rate of 2.4 per 100,000 population.

Prostitution is illegal in Cambodia but yet appears to be prevalent. In a series of 1993 interviews of women about prostitution, three quarters of the interviewees found being a prostitute to be a norm and a profession they felt was not shameful having. That same year, it was estimated that there were about 100,000 sex workers in Cambodia.

On 18 August 2019, Prime Minister Hun Sen signed a directive banning the Finance Ministry from issuing new online gambling licenses, while operators currently holding online licenses would only be allowed to continue operating until those licenses expire. The directive cited the fact that "some foreigners have used this form of gambling to cheat victims inside and outside the country" as justifying the new policy. Cambodia had issued over 150 such licenses before the new policy was announced.

Various factors contribute to the Cambodian culture including Theravada Buddhism, Hinduism, French colonialism, Angkorian culture, and modern globalization. The Cambodian Ministry of Culture and Fine Arts is responsible for promoting and developing Cambodian culture. Cambodian culture not only includes the culture of the lowland ethnic majority, but also some 20 culturally distinct hill tribes colloquially known as the Khmer Loeu, a term coined by Norodom Sihanouk to encourage unity between the highlanders and lowlanders.

Rural Cambodians wear a krama scarf which is a unique aspect of Cambodian clothing. The sampeah is a traditional Cambodian greeting or a way of showing respect to others. Khmer culture, as developed and spread by the Khmer empire, has distinctive styles of dance, architecture, and sculpture, which have been exchanged with neighbouring Laos and Thailand throughout history. Angkor Wat (Angkor means "city" and Wat means "temple") is the best-preserved example of Khmer architecture from the Angkorian era along with hundreds of other temples that have been discovered in and around the region.

Traditionally, the Khmer people have a recorded information on Tra leaves. Tra leaf books record legends of the Khmer people, the Ramayana, the origin of Buddhism and other prayer books. They are taken care of by wrapping in cloth to protect from moisture and the climate.

Bon Om Touk (Cambodian Water & Moon Festival), the annual boat rowing contest, is the most attended Cambodian national festival. Held at the end of the rainy season when the Mekong River begins to sink back to its normal levels allowing the Tonle Sap River to reverse flow, approximately 10% of Cambodia's population attends this event each year to play games, give thanks to the moon, watch fireworks, dine, and attend the boat race in a carnival-type atmosphere.

Popular games include soccer, kicking a sey, which is similar to a footbag, and chess. Based on the classical Indian solar calendar and Theravada Buddhism, the Cambodian New Year is a major holiday that takes place in April. Recent artistic figures include singers Sinn Sisamouth and Ros Serey Sothea (and later Preap Sovath and Sokun Nisa), who introduced new musical styles to the country.

Every year, Cambodians visit pagodas across the country to mark the Pchum Ben (Ancestors' Day). During the 15-day festival, people offer prayers and food to the spirits of their dead relatives. For most Cambodians, it is a time to remember their relatives who died during the 1975–1979 Khmer Rouge regime.

Rice is the staple grain, as in other Southeast Asian countries. Fish from the Mekong and Tonlé Sap rivers is also an important part of the diet. The supply of fish and fish products for food and trade as of 2000 was 20 kilograms (44 pounds) per person or 2 ounces per day per person. Some of the fish can be made into prahok for longer storage.

The cuisine of Cambodia contains tropical fruits, soups and noodles. Key ingredients are kaffir lime, lemon grass, garlic, fish sauce, soy sauce, tamarind, ginger, oyster sauce, coconut milk and black pepper. Some delicacies are num banhchok (នំបញ្ចុក), fish amok (អាម៉ុកត្រី) and aping (អាពីង). The country also boasts various distinct local street foods.

French influence on Cambodian cuisine includes the Cambodian red curry with toasted baguette bread. The toasted baguette pieces are dipped in the curry and eaten. Cambodian red curry is also eaten with rice and rice vermicelli noodles. Probably the most popular dine out dish, kuyteav, is a pork broth rice noodle soup with fried garlic, scallions, green onions that may also contain various toppings such as beef balls, shrimp, pork liver or lettuce. Kampot pepper is reputed to be the best in the world and accompanies crab at the Kep crab shacks and squid in the restaurants on the Ou Trojak Jet river. The cuisine is relatively unknown to the world compared to that of its neighbours Thailand and Vietnam.

Cambodians drink plenty of tea, grown in Mondulkiri Province and around Kirirom. te krolap is a strong tea, made by putting water and a mass of tea leaves into a small glass, placing a saucer on top, and turning the whole thing upside down to brew. When it is dark enough, the tea is decanted into another cup and plenty of sugar added, but no milk. Lemon tea te kdau kroch chhma, made with Chinese red-dust tea and lemon juice, is refreshing both hot and iced and is generally served with a hefty dose of sugar. Regarding coffee, the beans are generally imported from Laos and Vietnam – although domestically produced coffee from Ratanakiri Province and Mondulkiri Province can be found in some places. Beans are traditionally roasted with butter and sugar, plus various other ingredients that might include anything from rum to pork fat, giving the beverage a strange, sometimes faintly chocolatey aroma.

Cambodia has several industrial breweries, located mainly in Sihanoukville Province and Phnom Penh. There are also a growing number of microbreweries in Phnom Penh and Siem Reap. As of 2019, there are 12 brewpubs or microbreweries in Cambodia. Rice wine is a popular alcoholic drink. Its quality varies widely and it is often infused with fruits or medicinal herbs. When prepared with macerated fruits or spices, like the Sombai liqueur, it is called sra tram (soaked wine).

Football (soccer) is one of the most popular sports, although professional organised sports are not as prevalent in Cambodia as in western countries because of the economic conditions. Soccer was brought to Cambodia by the French and became popular with the locals. The Cambodia national football team managed fourth in the 1972 Asian Cup, but development has slowed since the civil war.

Western sports such as basketball, volleyball, bodybuilding, field hockey, rugby union, golf, and baseball are gaining popularity. Volleyball is by far the most popular sport in the country. Native sports include traditional boat racing, buffalo racing, Pradal Serey, Khmer traditional wrestling and Bokator. Cambodia first participated in the Olympics during the 1956 Summer Olympic Games sending equestrian riders. Cambodia also hosted the GANEFO Games in 1966 and recently, the SEA Games in 2023.

Cambodian dance can be divided into three main categories: Khmer classical dance, folk dance, and social dances. The exact origins of Khmer classical dance are disputed. Most native Khmer scholars trace modern dance forms back to the time of Angkor, seeing similarities in the temple engravings of the period, while others hold that modern Khmer dance styles were learned (or re-learned) from Siamese court dancers in the 1800s.

Khmer classical dance is the form of stylised performance art established in the royal courts of Cambodia exhibited for both entertainment and ceremonial purposes. The dances are performed by intricately costumed, highly trained men and women on public occasions for tribute, invocation or to enact traditional stories and epic poems such as Reamker, the Khmer version of the Ramayana. Known formally as Robam Preah Reach Troap (របាំព្រះរាជទ្រព្យ "theater of royal wealth") it is set to the music of a pinpeat ensemble accompanied by a vocal chorus.

Cambodian folk dance, often performed to mahori music, celebrates the various cultural and ethnic groups of Cambodia. Folk dances originated in the villages and are performed, for the most part, by the villagers for the villagers. The movements are less stylised and the clothing worn is that of the people the dancers are portraying, such as hill tribes, Chams or farmers. Typically faster-paced than classical dance, folk dances display themes of the "common person" such as love, comedy or warding off evil spirits.

Social dances are those performed by guests at banquets, parties or other informal social gatherings. Khmer traditional social dances are analogous to those of other Southeast Asian nations. Examples include the circle dances Romvong and Romkbach as well as Saravan and Lam Leav. Modern western popular dances including Cha-cha, Bolero, and the Madison, have also influenced Cambodian social dance.

The National Library of Cambodia opened in 1924. It suffered much destruction during the Khmer Rouge era.

Traditional Cambodian music dates back as far as the Khmer Empire. Royal dances like the Apsara Dance are icons of the Cambodian culture as are the Mahori ensembles that accompany them. More rural forms of music include Chapei and Ayai. The former is popular among the older generation and is most often a solo performance of a man plucking a Cambodian guitar (chapei) in between a cappella verses. The lyrics usually have moral or religious theme.

A Yai can be performed solo or by a man and woman and is often comedic in nature. It is a form of lyrical poetry, often full of double entendres, that can be either scripted or completely impromptu and ad-libbed. When sung by a duo, the man and women take turns, "answering" the other's verse or posing riddles for the other to solve, with short instrumental breaks in between verses. Pleng kaah (lit. "wedding music") is a set of traditional music and songs played both for entertainment and as accompaniment for the various ceremonial parts of a traditional, days-long Khmer wedding.

Cambodian popular music is performed with western style instruments or a mixture of traditional and western instruments. Dance music is composed in particular styles for social dances. The music of crooner Sinn Sisamouth, Ros Sereysothea, and Pen Ran from the 1960s to the 1970s is considered to be the classic pop music of Cambodia. During the Khmer Rouge Revolution, many classic and popular singers of the 1960s and 1970s were murdered, starved to death, or overwork to death by the Khmer Rouge. and many original master tapes from the period were lost or destroyed.

In the 1980s, Keo Surath, (a refugee resettled in the United States) and others carried on the legacy of the classic singers, often remaking their popular songs. The 1980s and 1990s also saw the rise in popularity of kantrum, a music style of the Khmer Surin set to modern instrumentation.

The Australian hip hop group Astronomy Class has recorded with Kak Channthy, a native-born Cambodian female singer.

The Dengue Fever rock and roll band features a Cambodian female singer and back-up band from California. It is classified as "world music" and combines Cambodian music with Western-style rock.

• Index of Cambodia-related articles
• Outline of Cambodia
• Landmines in Cambodia

• Cambodia. The World Factbook. Central Intelligence Agency.
• Cambodia from UCB Libraries GovPubs (archived 3 July 2008)
• Cambodia at Curlie
• Cambodia profile from the BBC News
• Cambodia at Encyclopædia Britannica
• Wikimedia Atlas of Cambodia
• Geographic data related to Cambodia at OpenStreetMap
• Key Development Forecasts for Cambodia from International Futures

Government

• King of Cambodia, Norodom Sihanouk Official website of former King Norodom Sihanouk (in French)
• "Cambodia.gov.kh". Archived from the original on 5 October 2006. Official Royal Government of Cambodia Website (English Version)
• Ministry of Foreign Affairs and International Cooperation
• Ministry of Tourism (archived 2 February 2002)

Civil society

• Cooperation Committee for Cambodia)
• Cambodian Human Rights and Development Association (archived 30 December 2010)
• Cambodian Center for Human Rights
• Cambodian League for the Promotion and Defense of Human Rights
• Action IEC Working For Cambodian Community Education Through Media and Culture
• Freedom in the World 2011: Cambodia.Archived 23 October 2011 at the Wayback Machine.
• Freedom of the Press 2011: Cambodia. Archived 7 January 2012 at the Wayback Machine.

The system of transport in Cambodia, rudimentary at the best of times, was severely damaged in the chaos that engulfed the nation in the latter half of the 20th century. The country's weak transport infrastructure hindered emergency relief efforts, exacerbating the logistical issues of procurement of supplies in general and their distribution. Cambodia received Soviet technical assistance and equipment to support the maintenance of the transportation network.

• Total - 38,257 km (2004)
  • Paved - 2,406 km (2004)
  • Unpaved - 35,851 km (2004)

Of the current total roadway network, only about 50% of the roads and highways are hard surfaced, all-weather, and in good condition. About 50% of the roads were constructed of crushed stone, gravel, or compacted earth. Secondary roads are of unimproved earth or were little more than tracks. In 1981 Cambodia opened a newly repaired section of National Route 1 which runs southeast from Phnom Penh to the Vietnamese border. The road, which suffered damage during the war years, was restored most probably by Vietnamese army engineers.

In the late-1980s, Cambodia's road network was both underutilized and unable to meet even the modest demands placed upon it by a preindustrial agrarian society. Commercial vehicles, such as trucks and buses, were insufficient in number and lacked the spare parts necessary to keep them running. Road construction and maintenance were ignored by a financially hard-pressed governments, while insurgents regularly destroyed bridges and rendered some routes unsafe for travel.

Cambodia is upgrading the main highways to international standards and most are vastly improved from 2006. Most main roads are now paved. And now road construction is on going from the Thailand border at Poipet to Siem Reap (Angkor Wat). Funded by over $3 billion of Chinese loans, Chinese companies have built 3,000 km (1,900 mi) of roads as well as several major bridges.

An expressway network is being developed, the 190km Phnom Penh-Sikhanoukville expressway (E4) opened in October 2022, the construction to Bavet started in June 2023.

Chart of 01/2014

Motorcycles are by far the most common transport medium in Cambodia. "Cyclo" (as hand-me-down French) or cycle rickshaws were popular in the 1990s but are increasingly replaced by remorques (carriages attached to motorcycles) and rickshaws imported from India. Cyclos are unique to Cambodia in that the cyclist sits behind the passenger(s) seat, as opposed to cycle rickshaws in neighbouring countries where the cyclist is at the front and pulls the carriage. With 78% mobile phone penetration rate, ride-hailing apps have become popular in recent years. The first locally owned ride-hailing app, ExNet taxi app, was launched in 2016, after which another locally developed PassApp taxi was also introduced.

The ExNet and PassApp use the same technology and architect for their application, except that ExNet is a taxi-based ride-hailing service while PassApp is more of rickshaw-based one. Uber and Grab joined the market in 2017. The entry and later merger of Uber and Grab did not negatively affect the local apps as the locals have the first-mover advantage and could secure a large number of patrons. As of today, PassApp is seen as an able competitor for the Singapore-based Grab in the Cambodian transport market. Thai Duong Bus Cambodia

Aside from the private-hire vehicles and ride-hailing service, public transport is also available but only in the capital. Phnom Penh city bus service started in 2015 with only three routes under the assistance of JICA. Today, Phnom Penh City Bus operates 13 routes.

Two rail lines exist, both originating in Phnom Penh and totaling about 612 kilometers of 1,000 mm (3 ft 3 3⁄8 in) metre gauge single track. The first line or the northern line, built by The French colonial government, running from Phnom Penh to Poipet on the Thai border, between 1930 and 1940, with Phnom Penh Railway Station opening in 1932. The final connection with Thailand was completed by Royal State Railways in 1942. The service from Bangkok to Battambang was suspended when the French Indochinese Government resumed sovereignty over Battambang and the Sisophon area from Thailand on 17 December 1946, as Thailand was seen as a supporter of Khmer Issarak, the anti-French, Khmer nationalist political movement.

A third line is planned to connect Phnom Penh with Vietnam, the last missing link of the planned rail corridor between Singapore and the city of Kunming, China. A new north–south line is also planned. The lines from Phnom Penh to Sisophon and from Sisophon to Poipet have been rehabilitated; starting with Poipet to Srey Sisophon in April 2018 and Sisophon to Phnom Penh in early July (2018).

The active part, the southern line, of the network is the Phnom Penh-Sihanoukville line, with stops at Takeo and Kampot. The first line to be re-opened in Cambodia was the 118 km long route from Phnom Penh to Touk Meas and the complete southern line in May 2011 (or Toll Royal Railway). Toll Royal Railway (Cambodia) had been given a 30-year concession from The Royal Government of Cambodia to operate Cambodia's railway network.

Phnom Penh - Pursat - Moung Ruessei - Battambang - Sisophon - Poipet

Phnom Penh - Takeo - Touk Meas - Damnak Chang'aeur - Veal Renh - Sihanoukville

The nation's extensive inland waterways were important historically in domestic trade. The Mekong and the Tonlé Sap Rivers, their numerous tributaries, and the Tonlé Sap provided avenues of considerable length, including 3,700 kilometers navigable all year by craft drawing 0.6 meters and another 282 kilometers navigable to craft drawing 1.8 meters. In some areas, especially west of the Mekong River and north of the Tonle Sap River, the villages were completely dependent on waterways for communications. Launches, junks, or barges transport passengers, rice, and other food in the absence of roads and railways.

According to the Ministry of Communications, Transport, and Post, Cambodia's main ferry services crossing the Bassac River and the middle Mekong River were restored in 1985. The major Mekong River navigation routes also were cleared for traffic. Seaplane service to all waterways and islands in now offered by Aero Cambodia Airline.

Cambodia has two major ports, Phnom Penh Autonomous Port and Sihanoukville Autonomous Port, also known as Kampong Som, and five minor ports. Phnom Penh, at the junction of the Bassac, the Mekong, and the Tonle Sap Rivers, is the only river port capable of receiving 8,000-ton ships during the wet season and 5,000-ton ships during the dry season. In 2018 the port received 205,000 TEUs totalling 2.9 million tonnes. Its 2018 profits were US$7.35 million, up 36% from 2017.

Sihanoukville port reopened in late-1979. It had been built in 1960 with French assistance. In 1980 some 180 Soviet dockworkers, having brought with them forklifts and trucks, were reportedly working at Kampong Som as longshoremen or as instructors of unskilled Cambodian port workers. By 1984 approximately 1,500 Cambodian port workers were handling 2,500 tons of cargo per day. According to official statistics, Sihanoukville had handled only 769,500 tons in the four prior years (1979 to 1983), a level that contrasted sharply with the port's peacetime capacity of about one million tons of cargo per year.

• Total: 626 ships (1,000 gross tonnage (GT) or over) totaling 953,105 GT/1,345,766 tonnes deadweight (DWT)
• Ships by type: bulk carrier 41, cargo ship 533, chemical tanker 10, container ship 8, passenger ship/cargo 6, petroleum tanker 11, refrigerated cargo 15, roll-on/roll-off 1, vehicle carrier 1 (2008)
• Note: 467 foreign-owned: Canada 2, China 193, Cyprus 7, Egypt 13, Gabon 1, Greece 3, Hong Kong 8, Indonesia 22, Japan 1, South Korea 22, Latvia 1, Lebanon 8, Netherlands 1, Romania 1, Russia 83, Singapore 4, Syria 48, Taiwan 1, Turkey 26, Ukraine 34, UAE 34, United States 6 (2008)

The country possesses twenty-six airfields, of which only thirteen were usable in the mid-1980s. Eight airfields had permanent-surface runways. Siem Reap-Angkor International Airport in the tourist city of Siem Reap is the largest airport and replaced Siem Reap International Airport. In the past, tourist traffic into Siem Reap International Airport saw passenger numbers overtook those of Phnom Penh in 2006.

Cambodia's second largest airport is Phnom Penh International Airport in Phnom Penh; it also serves as the main base for the renascent Cambodian Air Force.

Cambodia also opened a new Soviet-built airfield at Ream, Sihanouk International Airport in late-1983, which never saw commercial air traffic until January 2007. There are additional airports in Battambang and Stung Treng.

The new national airline Cambodia Angkor Air was launched in 2009, with an investment from Vietnam Airlines. Aero Cambodia Airline started business in 2011 offering flights to all airports and waterways with seaplanes.

Techo Takhmao International Airport, intended to replace the existing Phnom Penh International Airport as the city's main airport, currently under construction in Kandal, Cambodia. Located about 30–40 kilometres (16–22 NM; 19–25 mi) south of Phnom Penh, it is expected to open in 2023 and be fully operational by 2025.

• Total: 6 (2010)
  • 2,500 to 3,000 m: 3
  • 1,500 to 2,500 m: 2
  • 1,000 to 1,500 m: 1

• Total: 11 (2010)
  • 1,500 to 2,500 m: 1
  • 1,000 to 1,500 m: 9
  • under 1,000 m: 1

• 1 (2010)

• State Secretariat of Civil Aviation
• Ministry of Public Works and Transport, of Cambodia
• Transport in Phnom Penh
• Phnom Penh International Airport

 This article incorporates public domain material from The World Factbook. CIA.

• The SihanoukVille Port
• Cambodians ride 'bamboo railway'
• Video, photos and travel diary of Cambodia's trains by traveller Tom Grundy.
• The Sihanoukville Airport
• Thai Duong bus in Cambodia
• National highways
• Inland waterways in Cambodia
• Buses in Cambodia
• SihanoukVille Train Station

The system of transport in Cambodia, rudimentary at the best of times, was severely damaged in the chaos that engulfed the nation in the latter half of the 20th century. The country's weak transport infrastructure hindered emergency relief efforts, exacerbating the logistical issues of procurement of supplies in general and their distribution. Cambodia received Soviet technical assistance and equipment to support the maintenance of the transportation network.

• Total - 38,257 km (2004)
  • Paved - 2,406 km (2004)
  • Unpaved - 35,851 km (2004)

Of the current total roadway network, only about 50% of the roads and highways are hard surfaced, all-weather, and in good condition. About 50% of the roads were constructed of crushed stone, gravel, or compacted earth. Secondary roads are of unimproved earth or were little more than tracks. In 1981 Cambodia opened a newly repaired section of National Route 1 which runs southeast from Phnom Penh to the Vietnamese border. The road, which suffered damage during the war years, was restored most probably by Vietnamese army engineers.

In the late-1980s, Cambodia's road network was both underutilized and unable to meet even the modest demands placed upon it by a preindustrial agrarian society. Commercial vehicles, such as trucks and buses, were insufficient in number and lacked the spare parts necessary to keep them running. Road construction and maintenance were ignored by a financially hard-pressed governments, while insurgents regularly destroyed bridges and rendered some routes unsafe for travel.

Cambodia is upgrading the main highways to international standards and most are vastly improved from 2006. Most main roads are now paved. And now road construction is on going from the Thailand border at Poipet to Siem Reap (Angkor Wat). Funded by over $3 billion of Chinese loans, Chinese companies have built 3,000 km (1,900 mi) of roads as well as several major bridges.

An expressway network is being developed, the 190km Phnom Penh-Sikhanoukville expressway (E4) opened in October 2022, the construction to Bavet started in June 2023.

Chart of 01/2014

Motorcycles are by far the most common transport medium in Cambodia. "Cyclo" (as hand-me-down French) or cycle rickshaws were popular in the 1990s but are increasingly replaced by remorques (carriages attached to motorcycles) and rickshaws imported from India. Cyclos are unique to Cambodia in that the cyclist sits behind the passenger(s) seat, as opposed to cycle rickshaws in neighbouring countries where the cyclist is at the front and pulls the carriage. With 78% mobile phone penetration rate, ride-hailing apps have become popular in recent years. The first locally owned ride-hailing app, ExNet taxi app, was launched in 2016, after which another locally developed PassApp taxi was also introduced.

The ExNet and PassApp use the same technology and architect for their application, except that ExNet is a taxi-based ride-hailing service while PassApp is more of rickshaw-based one. Uber and Grab joined the market in 2017. The entry and later merger of Uber and Grab did not negatively affect the local apps as the locals have the first-mover advantage and could secure a large number of patrons. As of today, PassApp is seen as an able competitor for the Singapore-based Grab in the Cambodian transport market. Thai Duong Bus Cambodia

Aside from the private-hire vehicles and ride-hailing service, public transport is also available but only in the capital. Phnom Penh city bus service started in 2015 with only three routes under the assistance of JICA. Today, Phnom Penh City Bus operates 13 routes.

Two rail lines exist, both originating in Phnom Penh and totaling about 612 kilometers of 1,000 mm (3 ft 3 3⁄8 in) metre gauge single track. The first line or the northern line, built by The French colonial government, running from Phnom Penh to Poipet on the Thai border, between 1930 and 1940, with Phnom Penh Railway Station opening in 1932. The final connection with Thailand was completed by Royal State Railways in 1942. The service from Bangkok to Battambang was suspended when the French Indochinese Government resumed sovereignty over Battambang and the Sisophon area from Thailand on 17 December 1946, as Thailand was seen as a supporter of Khmer Issarak, the anti-French, Khmer nationalist political movement.

A third line is planned to connect Phnom Penh with Vietnam, the last missing link of the planned rail corridor between Singapore and the city of Kunming, China. A new north–south line is also planned. The lines from Phnom Penh to Sisophon and from Sisophon to Poipet have been rehabilitated; starting with Poipet to Srey Sisophon in April 2018 and Sisophon to Phnom Penh in early July (2018).

The active part, the southern line, of the network is the Phnom Penh-Sihanoukville line, with stops at Takeo and Kampot. The first line to be re-opened in Cambodia was the 118 km long route from Phnom Penh to Touk Meas and the complete southern line in May 2011 (or Toll Royal Railway). Toll Royal Railway (Cambodia) had been given a 30-year concession from The Royal Government of Cambodia to operate Cambodia's railway network.

Phnom Penh - Pursat - Moung Ruessei - Battambang - Sisophon - Poipet

Phnom Penh - Takeo - Touk Meas - Damnak Chang'aeur - Veal Renh - Sihanoukville

The nation's extensive inland waterways were important historically in domestic trade. The Mekong and the Tonlé Sap Rivers, their numerous tributaries, and the Tonlé Sap provided avenues of considerable length, including 3,700 kilometers navigable all year by craft drawing 0.6 meters and another 282 kilometers navigable to craft drawing 1.8 meters. In some areas, especially west of the Mekong River and north of the Tonle Sap River, the villages were completely dependent on waterways for communications. Launches, junks, or barges transport passengers, rice, and other food in the absence of roads and railways.

According to the Ministry of Communications, Transport, and Post, Cambodia's main ferry services crossing the Bassac River and the middle Mekong River were restored in 1985. The major Mekong River navigation routes also were cleared for traffic. Seaplane service to all waterways and islands in now offered by Aero Cambodia Airline.

Cambodia has two major ports, Phnom Penh Autonomous Port and Sihanoukville Autonomous Port, also known as Kampong Som, and five minor ports. Phnom Penh, at the junction of the Bassac, the Mekong, and the Tonle Sap Rivers, is the only river port capable of receiving 8,000-ton ships during the wet season and 5,000-ton ships during the dry season. In 2018 the port received 205,000 TEUs totalling 2.9 million tonnes. Its 2018 profits were US$7.35 million, up 36% from 2017.

Sihanoukville port reopened in late-1979. It had been built in 1960 with French assistance. In 1980 some 180 Soviet dockworkers, having brought with them forklifts and trucks, were reportedly working at Kampong Som as longshoremen or as instructors of unskilled Cambodian port workers. By 1984 approximately 1,500 Cambodian port workers were handling 2,500 tons of cargo per day. According to official statistics, Sihanoukville had handled only 769,500 tons in the four prior years (1979 to 1983), a level that contrasted sharply with the port's peacetime capacity of about one million tons of cargo per year.

• Total: 626 ships (1,000 gross tonnage (GT) or over) totaling 953,105 GT/1,345,766 tonnes deadweight (DWT)
• Ships by type: bulk carrier 41, cargo ship 533, chemical tanker 10, container ship 8, passenger ship/cargo 6, petroleum tanker 11, refrigerated cargo 15, roll-on/roll-off 1, vehicle carrier 1 (2008)
• Note: 467 foreign-owned: Canada 2, China 193, Cyprus 7, Egypt 13, Gabon 1, Greece 3, Hong Kong 8, Indonesia 22, Japan 1, South Korea 22, Latvia 1, Lebanon 8, Netherlands 1, Romania 1, Russia 83, Singapore 4, Syria 48, Taiwan 1, Turkey 26, Ukraine 34, UAE 34, United States 6 (2008)

The country possesses twenty-six airfields, of which only thirteen were usable in the mid-1980s. Eight airfields had permanent-surface runways. Siem Reap-Angkor International Airport in the tourist city of Siem Reap is the largest airport and replaced Siem Reap International Airport. In the past, tourist traffic into Siem Reap International Airport saw passenger numbers overtook those of Phnom Penh in 2006.

Cambodia's second largest airport is Phnom Penh International Airport in Phnom Penh; it also serves as the main base for the renascent Cambodian Air Force.

Cambodia also opened a new Soviet-built airfield at Ream, Sihanouk International Airport in late-1983, which never saw commercial air traffic until January 2007. There are additional airports in Battambang and Stung Treng.

The new national airline Cambodia Angkor Air was launched in 2009, with an investment from Vietnam Airlines. Aero Cambodia Airline started business in 2011 offering flights to all airports and waterways with seaplanes.

Techo Takhmao International Airport, intended to replace the existing Phnom Penh International Airport as the city's main airport, currently under construction in Kandal, Cambodia. Located about 30–40 kilometres (16–22 NM; 19–25 mi) south of Phnom Penh, it is expected to open in 2023 and be fully operational by 2025.

• Total: 6 (2010)
  • 2,500 to 3,000 m: 3
  • 1,500 to 2,500 m: 2
  • 1,000 to 1,500 m: 1

• Total: 11 (2010)
  • 1,500 to 2,500 m: 1
  • 1,000 to 1,500 m: 9
  • under 1,000 m: 1

• 1 (2010)

• State Secretariat of Civil Aviation
• Ministry of Public Works and Transport, of Cambodia
• Transport in Phnom Penh
• Phnom Penh International Airport

 This article incorporates public domain material from The World Factbook. CIA.

• The SihanoukVille Port
• Cambodians ride 'bamboo railway'
• Video, photos and travel diary of Cambodia's trains by traveller Tom Grundy.
• The Sihanoukville Airport
• Thai Duong bus in Cambodia
• National highways
• Inland waterways in Cambodia
• Buses in Cambodia
• SihanoukVille Train Station

Cambodia, officially the Kingdom of Cambodia, is a country in Mainland Southeast Asia. Cambodia borders Thailand to the northwest, Laos to the north, Vietnam to the east, and has a coastline along the Gulf of Thailand on the southwest. Cambodia spans an area of 181,035 square kilometres (69,898 square miles), and has a population of about 17 million. Its capital and most populous city is Phnom Penh.

In 802 AD, Jayavarman II declared himself king, uniting the warring Khmer princes of Chenla under the name "Kambuja". This marked the beginning of the Khmer Empire. The Indianised kingdom facilitated the spread of first Hinduism and then Buddhism to Southeast Asia and undertook religious infrastructural projects throughout the region. In the fifteenth century, Cambodia experienced a decline of power, and in 1863, it became a protectorate of France. After a period of Japanese occupation during the Second World War, Cambodia gained independence in 1953. The Vietnam War extended into the country in 1965 via the Ho Chi Minh and Sihanouk trails. A 1970 coup installed the US-aligned Khmer Republic, which was overthrown by the Khmer Rouge in 1975. The Khmer Rouge ruled the country and carried out the Cambodian genocide from 1975 until 1979, when they were ousted in the Cambodian–Vietnamese War. The Vietnamese-occupied People's Republic of Kampuchea became the de facto government. Following the 1991 Paris Peace Accords which formally ended the war with Vietnam, Cambodia was governed by a United Nations mission (1992–93). The UN withdrew after holding elections in which around 90% of the registered voters cast ballots. The 1997 coup d'état consolidated power under Prime Minister Hun Sen and the Cambodian People's Party (CPP). While constitutionally a multi-party state, CPP dominates the political system and dissolved its main opposition party in 2017, making Cambodia a de facto one-party state.