Five provinces circled the area of Tonle Sap Lake, more than three million of population inhabited around the bank of the Lake and 90% of them earn a living by catching fish and making agricultures.
The Lake is the largest fresh water 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.
Its dimension changes depending on the monsoon and dry season. During raining season from June to October, the lake is filled by water flowing from the Mekong with 14 meters in depth and expands the surface of 10,000 square Kilometers. In dry season from November to May its size 3,000 square kilometers with two meters in depth and water flows out from the Lake to the Mekong, in and out flowing is the natural phenomenon occurrences.