Richat's structure, the 'eye of the Sahara'.

The Richat structure, is a singular geological structure located in the Sahara desert in Mauritania, near Uadane.

The structure, with a diameter of almost 50 km, has attracted attention since the first space missions because it forms a rare ox's eye in the monotonous stretch of the desert.

Over the years and research, scientists have concluded that Richat’s structure is but a section of an anticlinic dome that has eroded over millions of years.