Smaller streams that flow into rivers are called tributaries. These tributaries contribute to the overall flow and volume of the main river.
Tributaries
Small streams and rivers that flow into larger ones are called tributaries. A tributary does not flow directly into a sea or ocean.
WEI
Tributaries
La Salle claimed the Mississippi River and its tributaries for the French.
Feeder creeks, or tributaries.
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Tributaries are the smaller rivers and where they join is called a confluence
Rivers and streams that flow in to a larger river are called tributaries. They all form in the same spot.
Tributaries flow into and distributaries flow away from.