Grand Canyon

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Grand Canyon Deep gorge in nw Arizona, USA, carved by the Colorado River. It is 450km (280mi) long, and varies from 6km (4mi) to 18km (11mi) in width. With its magnificent multicoloured rock formations revealing hundreds of millions of years of geological history, the Grand Canyon is one of the great wonders of the natural world.

http://www.nps.gov/grca

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