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An estuary.
Surface currents
It is called a delta. Or an estuary. It is the mouth of the river.
a tributary
Ocean convection currents move the deep cold water to the surface of oceans.
There is a specific word in French for a river flowing into the ocean (as opposed to into another river), which is "fleuve" (masculine noun). A river which flows into another one is "une rivière" (feminine noun).
The river reaches the sea in its Estuary.
The ocean
The head source.
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A place where a river rises is called the source or headwaters of the river. This is typically the point where the river begins, either from a spring, glacier, or other water source.
The end is called the mouth, where it will usually flow into a lake or sea. The end of the river is called an estuary.