What name is given to a drainage basin that retains water with no outflow to other external bodies of water?

An endorheic basin (also spelled endoreic basin or endorreic basin) is a drainage basin that normally retains water and allows no outflow to other external bodies of water, such as rivers or oceans, but drainage converges instead into lakes or swamps, permanent or seasonal, that equilibrate through evaporation. They are also called closed or terminal basins or internal drainage systems or basins.

Endorheic water bodies include some of the largest lakes in the world, such as the Caspian Sea, the world's largest inland body of water.

Basins with subsurface outflows which eventually lead to the ocean are generally not considered endorheic; they are cryptorheic.

Endorheic basins constitute local base levels, defining a limit of erosion and deposition processes of nearby areas.