Try "canyon".
Canyon
the river running through rock wear it down into deep valley with the steep sides what is it called
A long, narrow valley between high cliffs is a canyon. Canyons within mountains, or gorges that have an opening on only one side are called box canyons. Slot canyons are very narrow canyons, often with smooth walls.
A wide stream valley has gently sloping sides and a broad, flat floor due to erosion over time by a large volume of water. In contrast, a narrow stream valley has steep, V-shaped sides and a narrow floor formed by fast-flowing water cutting through the landscape.
Some prominent features of a narrow V-shaped valley with a stream profile that drops rapidly include steep, rocky walls, minimal vegetation due to the harsh environment, a high-gradient stream flowing through the valley, and the potential for waterfalls and cascades as the stream descends quickly.
A flowing water that is confined to a narrow depression in the Earth is called a stream or a creek. These water bodies typically have defined channels that carry water downstream due to gravity.
The narrow strip of water flowing relatively fast through the ocean is called a "current." These currents can be found at various depths and can significantly influence climate, weather patterns, and marine ecosystems. One well-known example is the Gulf Stream, which transports warm water from the tropics to the North Atlantic.
Ravine: A deep, narrow gorge with steep sides formed by erosion from a stream or river.
Jet streams are fast flowing, narrow air currents found in the atmospheres of some planets, including Earth.
A Gorge
stream discharge is the amount of water flowing through a space OR increases between its source or mouth
The jet stream is located in the tropopause, which is the boundary between the troposphere and the stratosphere. It is a fast-flowing, narrow air current that moves from west to east at high altitudes.