https://science.nasa.gov/photojournal/richat-structure-mauritania/
Richat Structure, Mauritania - NASA Science
Jun 17, 2004 - 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...
structuremauritanianasascience
https://www.skyatnightmagazine.com/space-science/richat-structure
Richat Structure, Eye of the Sahara | BBC Sky at Night Magazine
Jul 15, 2024 - The Richat Structure is a prominent landform in the Sahara, often photographed from space. But if it's not an impact crater, then what is it?
bbc sky at nightof thestructureeye