The strange eye of Africa, Mauritania
The Richat Structure , also known as the Eye of the Sahara or blue eye of Africa, is a prominent geological circular feature in the Sahara desert in Mauritania near Ouadane. From space this mysterious depression really does look like a human eye. The structure is 50 kilometers in diameter, large enough in the featureless Sahara that the earliest space missions used it as a landmark. ...