Tributary

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The thick blue line is the river. The thin blue line is its tributary.

A tributary of a river is another river that flows into it. If one river flows into a second river, then the first river is a tributary of the second river. A tributary is a body of water that flows into another body of water.

The opposite of a tributary is a distributary. A distributary is a river that branches off from the main flow of water, for example in a river delta.