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Cambodia
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The Tonle Sap Lake of Cambodia is one of the largest lakes in Asia, and is unique in that the direction of flow of the river changes by season. In June and November the Tonle Sap River changes direction. In June, with monsoon rains swelling the Mekong river, excess water is pushed into the Tonle Sap that then drains back upstream into the lake, flooding the surrounding low plains. By monsoon's end, in November, the pressure is relieved and the Tonle Sap reverses course and returns to the direction of flow expected of it.
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