hanging valley

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Minor (tributary) valley that joins a larger glacial trough at a higher level than the trough floor. During glaciation the ice in the smaller valley was unable to erode as deeply as the ice in the trough, and so the valley was left perched high on the side of the trough when the ice retreated. A river or stream flowing along the hanging valley often forms a waterfall as it enters the trough. The Bridal Veil Falls in Yosemite National Park (USA) is an excellent example.

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