Tributary: Stream or river that flows into a main stem river or lake
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.
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