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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.
Many names for small rivers are specific to geographic location; examples are run in some parts of the United States,  burn  in Scotland and northeast England, and beck in northern England. Sometimes a river is defined as being larger than a creek, but not always: the language is vague. river begins at a source (or more often several sources) and ends at a mouth, following a path called a course. The water in a river is usually confined to a channel, made up of a stream bed between banks. In larger rivers there is also a wider floodplain shaped by flood-waters over-topping the channel.