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Yosemite Valley, California
Glaciers carved this steep-walled valley, now occupied by the Merced River, in California's Yosemite National Park. Waterfalls cascade down the valley's steep walls, carved away by the massive, slow-moving blocks of snow and ice.
Photograph by Larry Fellows, Arizona Geological Survey

Valleys

See valley photos (including the Nile River Valley, Yosemite Valley, and more) in this photo gallery from National Geographic.