<Li> Glacial valley: a depression carved by erosion by a glacier . </Li> <Li> River valley: a depression carved by fluvial erosion by a river . </Li> <Li> Area of subsidence caused by the collapse of an underlying structure such as sinkholes in karst terrain . </Li> <Li> Sink: an endorheic depression generally containing a persistent or intermittent (seasonal) lake, a salt flat (playa) or dry lake, or an ephemeral lake . </Li>

Small depression in land that have been filled with water