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The showers is the beginning of a river. The waterfall is a body of water. The upper course is the beginning of a river. The water flows quickly and the river is small.

2
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A tributary is a river that empties into a river.

3
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The mouth. The mouth is the end of a river.

4
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The confluence. The point where two rivers meet is called the confluence.

5
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And the lower post. In the lower post, the water flows more slowly and the rivers are wider.

6
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In the global course, the river empties into the sea over the river.