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Canyonlands National Park, Utah, satellite image. The Colorado River (upper right down to centre middle) and Green River (left) have eroded the landscapes to form numerous canyons and other formations. Image taken in May 2014 by the OLI (Operational Land Imager) on board the Landsat 8 space satellite. This image covers an area measuring 100 kilometres squared. (KEYSTONE/SCIENCE PHOTO LIBRARY/US GEOLOGICAL SURVEY/SCIENCE PHOTO LIBRARY)