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Tonle Sap Great Lake

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Tonle Sap Great Lake : The Tonlé Sap (Khmer: ទន្លេសាប; "Tonlé" meaning "Large Fresh Water River," but more commonly translated as "Great Lake") is a combined lake and river system of major importance to Cambodia. Since "Tonlé" translates as "Great lake or river", any reference to the "Tonlé Sap Lake" is an unnecessary repetition of what is the "Sap Lake", and any reference to the "Tonlé Sap River" an unnecessary repetition of what is the "Sap River". The Tonlé Sap is the largest freshwater lake in South East Asia and is an ecological hot spot that was designated as a UNESCO biosphere in 1997. The Tonlé Sap is unusual for two reasons: its flow changes direction twice a year, and the portion that forms the lake expands and shrinks dramatically with the seasons. From November to May, Cambodia's dry season, the Tonlé Sap drains into the Mekong River at Phnom Penh. However, when the year's heavy rains begin in June, the Tonlé Sap backs up to form an enormous lake.


For most of the year the lake is fairly small, around one meter deep and with an area of 2,700 square km. During the monsoon season, however, the Tonlé Sap river, which connects the lake with the Mekong river, reverses its flow. Water is pushed up from the Mekong into the lake, increasing its area to 16,000 square km and its depth to up to nine meters, flooding nearby fields and forests. The floodplain provides a perfect breeding ground for fish.


The pulsing system with the large floodplain, rich biodiversity, and high annual sediment and nutrient fluxes from Mekong makes the Tonlé Sap one of the most productive inland fisheries in the world, supporting over three million people and providing over 75 percent of Cambodia's annual inland fish catch and 60 percent of Cambodians' protein intake. At the end of the rainy season, the flow reverses and the fish are carried downriver.


National and local observers often state that the Tonlé Sap Lake is rapidly filling with sediment. However, recent long-term sedimentation studies show that net sedimentation within the lake proper has been in the range of 0.1-0.16 mm/year since circa 5,500 years before present. Thus, there is no threat of the lake filling up with sediment. On the contrary, sediment is not a threat to the lake but an important part of its ecosystem, providing nutrients that drive the floodplain productivity.


The reversal of the Tonlé Sap river's flow also acts as a safety valve to prevent flooding further downstream. During the dry season (December to April) the Tonlé Sap Lake provides around 50% of the flow to the Mekong Delta in Vietnam.


The lake occupies a depression created due to the geological stress induced by the collision of the Indian subcontinent with Asia. In recent years the building of high dams in Southern China and Laos has threatened the strength and volume of the reverse flow into Tonle Sap; a phenomenon that environmentalists have been slow to recognize or raise concern about. Already fish catches are significantly down.


The Tonle Sap Lake and its surrounding provinces are part of the Tonle Sap Biosphere Reserve. There are nine provinces that are part of the Tonle Sap Biosphere Reserve, these are; Banteay Meanchey, Battambang, Kampong Chhnang, Kampong Thom, and Siem Reap.


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