Tonle Sap Lake, Siem Reap - Cambodia

Tonle Sap Lake is the largest fresh water lake in Southeast Asia of Siem Reap - Cambodia. The Tonle Sap River is the only river in the world that flows in both directions. Trips out to the lake are best in rainy season because the mangrove swamps are dried up at other times. The birds at the bird sanctuary are best viewed from December to April. The Tonle Sap basin is lush and green when the water recedes in the dry season, but the water is so low that getting around on the lake, which drops down to four metres in depth, and falls to a third of its rainy-season size, is quite difficult.