The Richat Structure (also known as the Eye of the Sahara) as photographed from the ISS. This geologic structure stretches almost 25 miles across the desert of central Mauritania. Photo credit: NASA

The Richat Structure (also known as the Eye of the Sahara) as photographed from the ISS. This geologic structure stretches almost 25 miles across the desert of central Mauritania.


Photo credit: NASA

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