The Tonle Sap is one of the freshwater lakes of Southeast Asia. It is the largest wet land more in the entire world. The lake has many types of fish and a single BIODIVERSITY. The lake dates from 5100-5600 years ago. In the Cambodian diet, fish provides more than 75% of the protein. There is a floating city where they live off water and their crops, and the stilt houses are on the lake shore. The level of the water can differ by several meters between dry season and the rainy season, depending.