A stream that branches off from a river is commonly referred to as a "tributary." Tributaries flow into the main river, contributing to its volume and watershed. They can vary in size and can also be referred to as creeks, brooks, or streams, depending on their specific characteristics.
Tributary is the answer you are looking for, I believe.
resorvoir
It is called a tributary
Comets have a stream of gas and dust coming off them.
a tributary is a stream coming off a river, and drainage means to drain(duh),e.g water can be drained
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.
A small freshwater river or stream flowing into a larger river is called a tributary or feeder river. A tributary is a stream or river that flows into a mainstem (or parent) river or a lake. For example, a tributary can be a creek that flows into a river. Or it can be a small river that flows into a larger river. A tributary does not flow directly into a sea or ocean. Some large rivers can have up to 100 tributaries. The spot where the smaller and larger river meet is called a "confluence". In contrast, a body of water that branches off and flows away from the main river is called a distributary.
a creek
A waterfall works by water from a river, stream or lake comes to a cliff, then the water falls off and goes into another river, stream or lake.
A large stream or creek, usually leading to or away from a river. From my understanding, it is called a "branch" because it "branches off" of a larger body of water.
Every river is part of a larger river system which includes the river and any tributaries that branch off of it.
The point where the river starts off is called the