From orbit it looks like a 40-kilometer bullseye carved into the Sahara, so perfect it tricks your brain into thinking it must be artificial. Astronauts use it to orient themselves, internet sleuths swear it’s the lost city of Atlantis, and for decades the world’s best geologists were certain a meteorite made it.

This episode unpacks the true story of Mauritania’s Richat Structure, the so-called Eye of Africa. We trace how the meteorite theory collapsed, how a subterranean magma dome actually built the rings, and how that geology turned the site into a prehistoric oasis and human toolmaking hub before debunking the Atlantis myth entirely.

• Why the early meteorite theory fell apart after a mineral first identified as coesite turned out to be ordinary barite
• How a Cretaceous-era magma dome pushed up sedimentary layers that differential erosion later carved into perfect concentric rings
• The African Humid Period, when rivers, playa lakes, and quartzite tool-stone made the rings a thriving settlement
• How archaeologists date jumbled surface tools using typology instead of stratigraphy after wind deflation stripped the soil
• The point-by-point case against the Atlantis claim, from the 100-million-year timeline to the inland desert location