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the part of a river that empties into a sea, lake, or another river. In rivers that dry out in their lower course, the place where the river terminates is designated the mouth.
Several types of mouth are distinguished. A simple mouth refers to the terminus of a river that does not divide into branches, such as the Tiber. Rivers may also terminate in deltas, as in the Nile; estuaries, as in the Thames; or limans, as in the Iuzhnyi Bug. A river may end in a discordant junction, which is characteristic of the tributaries of mountain rivers in which downcutting has been less intensive than in the principal river. If a river does not transport its waters to a sea, lake, or another river, it is sometimes said to terminate in a blind end.
Most large rivers that empty into a sea or large lake contain bars at the mouth; farther upriver are deep reaches that provide the customary wintering places for fish, such as the fish preserve pools in the Volga delta. The hydrological regime of river mouths is characterized by a complex variation in flow velocities, caused by such factors as ebb and flow, surge, increased flow rate during high water (ocean and lake rivers), and ice jams formed by drifting ice.
What does it mean when you dream about a mouth?
A big mouth indicates gossip and the spreading of lies, or perhaps spoken words of goodness and truth. Romantic or sexual urges are associated with this symbol, too.