The Eye of Sahara, also called The Richat Structure is a prominent circular geological feature in the Sahara‘s Adrar Plateau, in west–central Mauritania, Northwest Africa.
It is an eroded geological dome, 40 kilometers (or 25 miles) in diameter, exposing sedimentary rock in layers that appear as concentric rings. The structure is also the location of exceptional accumulations of Acheulean archaeological artifacts which are Neolithic stone tools. Pre-Acheulean stone tools also have been found and freshwater fossils from African humid period. It is a deeply eroded, slightly elliptical dome .
The sedimentary rock exposed in this dome ranges in age from Late Proterozoic to Ordovician sandstone. It was initially considered to be an impact structure but a closer study suggested that it might instead have been formed by terrestrial processes and is an uplifted geologic dome, also known as a domed anticline. Some claimed the Richat structure has been the site of Atlantis mentioned in the works of Plato but no evidence of a city ever being built at the location.