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.
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NASA's Incredible Shot Of The Sahara. The eye of the Sahara The Richat structure, on the African continent, is visible from space thanks to its almost 50 km in diameter and called attention to its curious concentric rings. It is located in the desert of the Sahara, Mauritania, at an altitude of 400 meters above sea level. It is believed that it is the product of the impact of a meteorite.
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The Richat Structure. A circular feature in the Sahara desert that is ~30 miles wide. Not an impact crater nor a volcano.