A tributary.
a creek
resorvoir
It is called a tributary
a small stream that runs into a main stem river or lake
The smaller stream is a tributary of a larger stream, river or lake.
When other rivers or lakes join to the main river . It is called the tributary .
exactly what you said the main stream and tributaries
A stream or river that feeds into another river is called a tributary. Tributaries play a crucial role in the overall health and flow of a river system, as they contribute water, nutrients, and sediment to the main river.
Creek
Geographically - A branch that flows into the main stream is called a Tributary. Literally it means - Paying tribute to. So one can understand as such that a small river is paying tribute to the larger one and shedding its water to large stream.
A tributary is a river or stream that flows into a larger river or body of water, while a distributary is a branch of a river that flows away from the main channel. Tributaries add water to the main river, while distributaries branch off from it.
It is a tributary.