A current
A moving stream of water in the ocean
tributary
tributary
tributary
tributary
The stream of water which flows like a river through the ocean is a current. The Gulf Stream is the most significant such current which flows from the tropics to the northern latitudes.
it gets water from the rain and the ocean
There is no single name for a single stream of water that flows into an ocean but headwaters would be a good one for a single stream of water into a lake
The mouth of a stream is where it meets a larger body of water, such as a lake, ocean, or another stream. It is where the stream's water flows out and mixes with the water of the larger body.
Ocean current
the Atlantic ocean
black