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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.
As tributaries join main stems at confluence after confluence, rivers become larger. Eventually, nearly all rivers do lead to another body of water, usually an ocean, a bay, or a large lake. The transition point between a river and these other bodies of water is known as a delta.