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Painted Wall—the tallest sheer cliff in Colorado at 2,250 feet (690 m). Lighter-colored pegmatite dikes are clearly visible. The Gunnison River drops an average of 34 feet per mile (6.4 m/km) through the entire canyon, making it the 5th steepest mountain descent in North America. By comparison, the Colorado River drops an average of 7.5 feet per mile (1.42 m/km) through the Grand Canyon.