the 40km 'Eye of the Sahara' = Atlantis crowd. let me save you the rabbit hole

Every few months the Eye of the Sahara / Richat Structure goes viral again as 'Atlantis found.' I went down this hole properly so you don't have to. It's in Mauritania near Ouadane, this enormous circular bullseye ~40km wide, looks unreal from orbit, astronauts have used it as a landmark for decades……