The Richat Structure,
also known as the Eye of the Sahara and Guelb er Richat, is a prominent
circular feature in the Sahara desert of west–central Mauritania near
Ouadane. Photo by cosmonaut Fyodor Yurchikhin and the Russian Space
Agency Press Services.
The structure is a deeply eroded, slightly elliptical, 40 km in
diameter dome. Differential erosion of resistant layers of quartzite has
created high-relief circular cuestas. Its center consists of a
siliceous breccia covering an area that is at least 3 km in diameter.
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