ravine a deep narrow steep-sided valley (especially one formed by running water)
north america the nations of the North American continent collectively
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Wiktionary
Substantiv
canyon -
A valley, especially a long, narrow, steep valley, cut in rock by a river.
Wikipedia
A canyon (occasionally spelled cañon) or gorge is a deep ravine between cliffs often carved from the landscape by a river. Rivers have a natural tendency to reach a baseline elevation, which is the same elevation as the body of water it will eventually drain into. This forms a canyon. Most canyons were formed by a process of long-time erosion from a plateau level.
OmegaWiki Dictionary
Ω
canyon A long deep, relatively narrow steep-sided valley confined between lofty and precipitous walls in a plateau or mountainous area, often with a stream at the bottom; similar to, but largest than, a gorge. It is characteristic of an arid or semiarid area (such as western U.S.) where stream downcutting greatly exceeds weathering.\n(Source: BJGEO)
canyon A valley, especially a long, narrow, steep valley, cut in rock by a river.