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Richat Structure, Mauretania

USGS; Link:

Since the first space missions, the circular “Richat Structure” in the northwest of Africa has ranked among the most striking points of orientation for astronauts. The “Eye of the Sahara” is 45 km in diameter and was initially interpreted as the result of a meteorite impact. Meanwhile, it is assumed to be a circular uplift of several layers of earth. Rocks of different solidness had been eroding to a greater or lesser extent over time, which led to the distinct looks of the “Richat Structure” as we know it today. However, the reason for the almost circular shape has remained unclear to this day.


Location: Mauretania, North Africa
Picture taken on March 31, 2003
Sensor: Landsat ETM+