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Cambodian boy playing on The Tonle Sap, a combined lake and river system of huge importance to Cambodia. The area is home to many ethnic Vietnamese and numerous Cham communities living in floating villages around the lake. The Tonle Sap is the largest freshwater lake in Southeast Asia and is an ecological hot spot that was designated as a UNESCO biosphere in 1997. The Tonle Sap is a branch of the mighty Mekong River.