US GEOLOGICAL SURVEY / SCIENCE PHOTO LIBRARY US GEOLOGICAL SURVEY / SCIENCE PHOTO LIBRARY
Blyde River Canyon, South Africa, satellite image. This canyon (seen here top left corner and running south bottom middle) measures 25 kilometres in total length and averages 750 in depth. It is surrounded by forest and vegetation (green). Image taken in June 2014 by the OLI (Operational Land Imager) on board the Landsat 8 space satellite. This image covers an area measuring 89 kilometres squared.
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