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.
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
it gets water from the rain and the ocean
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