is a natural flowing watercourse, usually freshwater, flowing towards an oceansealake or another .

In some cases, a flows into the ground and becomes dry at the end of its course without reaching another body of . Small rivers can be referred to using names such as stream, creek, brook, rivulet, and rill.

There are no official definitions for the generic term as applied to geographic features, although in some countries or communities a stream is defined by its size.