it sounds like a drainage basin
The area where a freshwater river or stream enters the ocean is called an estuary. It is a coastal area of brackish water formed when freshwater enters the ocean.
an area drained by a river is called pooo lol
A water cycle :]
The land area where a river collects water is known as its watershed or drainage basin. This is the area of land where all the water that falls within its boundaries flows into a specific river or stream.
A shallow place in a river is called a ford if it is used as a place to wade across to the other side. A shallow place can also be called a sandbar if the water does not cover all of the sand in a river or stream.
A drainage basin/ watershed.
the area from which water drains into a river is called the river's catchment. A river's watershed is the connecting ridges surrounding the watershed, and separating it from adjacent ones.
The term for river water entering a lake is called the lake's inflow.The entry of a river or stream into a terminal lake, sea or ocean is called the mouth of the river.A related term, estuary, refers to a tidal area that extends upstream from the mouth.
water shed
I believe its called a water shed but I'm not completely sure about that.AnswerA watershed (one word) is a ridge or other dividing line between stream catchments, although the term is (confusingly) also applied to the catchment area. Another term is drainage basin.
It is called a delta.
The beginning of the river usually starts in mountainsided areas or in small lakes. It is also called a creek or stream.