A couloir is a narrow gully with a steep gradient found in mountainous terrain. This description is adapted from Wikipedia contributors under CC BY-SA 4.0; changes were made. https://creativecommons.org/licenses/by-sa/4.0/
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Couloir (Wikipedia)
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A couloir (French: [ku.lwaŹ], "passage" or "corridor") is a narrow gully with a steep gradient in mountainous terrain.
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