This spectacular landform in Mauritania in the southwestern part of the Sahara desert, called the Richat Structure, is so huge with a diameter of 30 miles that it is visible from space. The formation was originally thought to be caused by a meteorite impact but now geologists believe it is a product of uplift and erosion. The cause of its circular shape is still a mystery. Mauritania, Nature, Sahara Deserts, Richat Structures, Places, Earth, Africa, Outer Spaces, Eye
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