Earth has Bullseye ~ This prominent circular feature, known as the Richat Structure, in the Sahara desert of Mauritania is often noted by astronauts because it forms a conspicuous bull's-eye on the otherwise rather featureless expanse of the desert.
Richat Structure in Mauritania is a giant circular bull's eye on the surface of the Earth, which still remains a mystery - there are various hypotheses of how it was formed, but the answer is yet to be revealed.
Eye of Africa, Mauritania was spotted by astronauts on early space missions. The formation has a diam. Scientists first thought a meteorite had hit the earth, causing this impression, but now is believed to be a symmetrical uplift that erosion ha