Best Answer
Confluence- when 2 rivers of almost the same size and discharge converge into one river.Tributary - when one minor river connects into the bigger one.
Other Answers (5)
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The word you are looking for is - confluence - which literally means flowing together. (From the Latin verb - confluere - to flow together.)
The term can be applied to two or more rivers or streams flowing together at the same point. -
a tributary is the river that runs into the other, that is the closest term to what you are thinking of that i can come up with.
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tributary
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Confluence
