Astronauts often note this prominent circular feature in the Sahara desert of Mauritania because it forms a conspicuous 30 mile wide bulls-eye on the otherwise rather featureless expanse of the desert.
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.
The continuous Fly Geyser of Fly Ranch is on private land in Nevada and began during a 1916 water well drilling that accidentally penetrated a geothermal source. via Green Fly Geyser Fine Art Print - Inge Johnsson