The Tonle Sap is a natural phenomenon. In the rainy season, the level of water in the Mekong River exceeds the elevation of the largest freshwater lake in Southeast Asia and forces the Tonle Sap River to flow upstream. The lake swells and fish, reptiles, birds, mammals, and plants thrive on this reverse hydrology. The Tonle Sap Basin Strategy promotes an approach that conserves nature and offers ...