High Quality Content by WIKIPEDIA articles! The list of drainage basins by area identifies areas larger than 400,000 km2 (150,000 sq mi), sorted by area, which drain to oceans, mediterranean seas, rivers, lakes and other waterbodies. It includes drainage basins which do not flow to the ocean (endorheic basins). It includes oceanic sea drainage basins which have hydrologically coherent areas (oceanic seas are set by IHO convention).