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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.
Most water is carried into the oceans by rivers. The place where a river meets the ocean is called a delta or estuary. These are special environments where the freshwater from rivers mixes with the salty ocean water. Some other water gets into the oceans when groundwater seeps out of the ground or when rain falls over the ocean.