Tributary.
The term used to describe one river emptying into another is "tributary." A tributary is a smaller stream or river that flows into a larger one, contributing its water to the main river system. The point where the tributary joins the larger river is called the confluence.
Tributary.
It Joins at a confluence. That is where the river joins the larger one.
The join of a small river (a tributary) joins a larger river (the main river) is called a confluence.
The smaller stream is a tributary of a larger stream, river or lake.
Tributary
The smaller river is a tributary to the big one.
when one stream meets another and they merge together, the smaller stream is known as a tributary.
Where two rivers meet is called a confluence.
It is not. It is the other way round, a stream or smaller river flowing into a larger one.
The base level of a river is the lowest place where it can flow, generally it's mouth. Therefore if a river or stream flows into another river, then the first river's base level is the point where it joins the other river.
The difference between a river and a stream is the name applied to it by local residents, and relative size. In the same region, something called a river is usually larger than something called a stream. However, something that is called a river in one place could be the same size as something called a stream in another place.