Published 7 March 2018 at 1920 × 1080 in Gallery: Africa from space The Richat Structure near Ouadane in central Mauritania is known as the Eye of the Sahara. This magnificent 40-kilometre-wide dome is the result of deep and ancient erosion of a long-dead volcano. (Axelspace Corporation, CC BY-SA 4.0) ‹ Return to post