JIM WEST / SCIENCE PHOTO LIBRARY JIM WEST / SCIENCE PHOTO LIBRARY
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Inner canyon and river, Grand Canyon National Park, Arizona, USA. Backpacker on the South Kaibab Trail viewing the inner canyon and the Colorado River. The 6-million-year-old Grand Canyon system is a set of gorges eroded from the rock by the Colorado River. It extends for hundreds of kilometres, is nearly 30 kilometres wide, and at its deepest is 1.5 kilometres deep. Photographed in March.
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