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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 Ohio River ends at the confluence with the Mississippi River at Cairo, Illinois. This confluence borders Kentucky, Illinois and Missouri. Even though the Ohio River is much wider and carries more water than the Mississippi where they meet, the Ohio is considered the tributary to the Mississippi.