The Richat Structure is an impact crater that is many millions of years old, was buried for millions of years, and subsequently exposed by a long period of erosion. The idea that is Plato's Atlantis originated AFAIK with the loon who has the Bright Insight YT channel, but has caught on here and there, in the same way that Sitchin's "Twelfth Planet" (or closer to topic, in the same way that Atlantis was the Minoan Aegean) has.
Crete
One of the most fascinating islands in Europe. Well worth the visit.
I have always assumed that Atlantis was the mis-remembered Trojan war and Aristotle kind of realized that that is why the story seems to end quickly, etc. Though I don’t do any drugs I don’t mind getting trippy with speculation that the Richat structure was a natural formation that was used by Ice Age peoples during a green Sahara era.