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The last part of a river. A river usually ends by flowing into an ocean, a lake or a bigger river. The place where the river flows out into a bigger body of water is called the 'mouth' of the river. As a river flows towards its mouth, the countryside around the river often changes from hilly to flat.
The Nile River in Egypt flows into the Mediterranean Sea. The end of a river is called its mouth, and with some rivers, such as the Nile, deposits of silt build up creating what is called a Delta. A river's delta area is very important to humans as the deposits of rich silt provide very fertile farmland.he Nile River in Egypt flows into the Mediterranean Sea. The end of a river is called its mouth, and with some rivers, such as the Nile, deposits of silt build up creating what is called a Delta. A river's delta area is very important to humans as the deposits of rich silt provide very fertile farmland.