Concentric Circles of the Richat Structure, Mauritania – May 15th, 201121.1N 11.4W
A a circular shape featuring concentric rings can be observed near the center of this image. This geographical features is the Richat Structure, also known as the Eye of the Sahara.
It is located in the Sahara desert of Mauritania near Ouadane. The structure has a diameter of approximately 50 kilometres (31 mi) and is located 400–450 metres (1,310–1,480 ft) above sea level.
Initially interpreted as a meteorite impact structure because of its high degree of circularity, it is now thought to be a symmetrical uplift (circular anticline or dome) that has been laid bare by erosion.