JIM WEST / SCIENCE PHOTO LIBRARY JIM WEST / SCIENCE PHOTO LIBRARY
Royal Arch, Grand Canyon National Park, Arizona, USA. This rock bridge is the largest natural arch in the Grand Canyon. 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 October.
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