Soustí

Soustí is a Czech geographic term used to describe the point where a river ends by flowing into a larger water body, such as a lake, sea, or another river. In broader usage, soustí can denote a river mouth or a confluence point where tributaries join to form a main stem. It is related to, but distinct from, ústí (the mouth of a river) and soutok (confluence).

In practice, the term appears in hydrographic descriptions and toponymy, particularly on maps of Czech-speaking regions. Features labeled soustí may include river mouths with estuarine characteristics or internal river confluences that influence local hydrology, sedimentation, and ecology. At soustí, ecological dynamics often involve brackish or mixed water, tidal influence if the outflow reaches a sea, and delta formation in suitable climates. Human use includes navigation, flood management, and land-use planning around river terminals and confluences.

See also: ústí, soutok, delta, estuary, hydrology, toponymy.