Slough

A long, narrow stretch of water such as a small stream or feeder tributary off a lake or river.

Movement of a soil mass downward along a slope because of a slope angle too great to support the soil, wetness reducing internal friction among particles, or seismic activity. It is also called a slope failure, usually a rather shallow failure. A wet place of deep mud or mire, or a temporary or permanent lake; ordinarily found on or at the edge of the flood plain or a river. Also refers to a creek or sluggish body of water in a bottomland.