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Hells Canyon, USA, satellite image. Hells Canyon was formed by the eroding action of the Snake River and cuts through the state line between Oregon (left side) and Idaho (right). It spans 16 kilometres across its widest point and 2,436 metres at its deepest when measured from river basin to the peak of He Devil Mountain. Image taken in July 2013 by the OLI (Operational Land Imager) on board the Landsat 8 space satellite. This image covers an area measuring 86 kilometres squared. (KEYSTONE/SCIENCE PHOTO LIBRARY/US GEOLOGICAL SURVEY/SCIENCE PHOTO LIBRARY)