The Southeastern Indochina dry evergreen forests occupy the lower portion of the Mekong Basin, where they are intertwined with the Central Indochina dry forests. The Southern Annamites montane rain forests border the dry evergreen forests on the east, occupying the higher elevations of the Annamite Range. To the south, the Indochina mangroves lie between tropical seasonal forests and the South China Sea. The Tonle Sap-Mekong peat swamp forests and Tonle Sap freshwater swamp forests lie to the southeast, in the seasonally and permanently flooded lowlands along the Tonle Sap and lower Mekong rivers and Tonle Sap Lake.