The Tonle Sap Lake in Cambodia is the largest fresh water lake in South-east Asia. One of its unique features is the change of direction of flow of water between dry and wet seasons.
When the weather is dry, water drains out from the lake by the Tonle Sap Riiver into the Mekong river. The lake shrinks in size and depth. The lake will then be about one fifth its larger possible size in rainy season. The depth of water will be about 1 meter.
In rainy season, the lake swells back to its larger size as a result of the back flow of water from the swollen Mekong river, flooding the dried up part of the lake.
The reversal of flow serves as a natural valve to prevent flood in the surrounding area of the Mekong river.
A productive inland fishery, the Tonle Sap lake provides a large portion of the country's inland fish production. The lake is a habitat for a great variety of plants, reptiles, mammals, birds and other animals. A few million people live on and around the lake with their livelihood revolving and depending on the activities in and around the lake.
a small township on the lake
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