Sunset illuminates sandstone and houseboats at sunset on Lake Powell, which is impounded by Glen Canyon Dam on the Colorado River on the Utah and Arizona border, USA. Lake Powell is the second largest man-made reservoir in the United States. The reservoir is named for explorer John Wesley Powell, a one-armed American Civil War veteran who explored the river via three wooden boats in 1869. The dam generates electrical power, controls flooding, and provides water recreation, at the cost of various environmental changes. (Panorama stitched from 10 photos.)
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