Young Stream or Young River whichever works
Rapids
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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.
Gulf Stream
Channel (Valley)
Huang he is the river that flows through china.
it could be a valley or a gorge
An ocean current.
Ocean current
It is known as rapids - a length of the river where rocks break the surface and the water is churned into what is known as white water.
That is a glacier. Glaciers form from compacted snow that has accumulated over time and flows downhill under the force of gravity.
it could be a valley or a gorge