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Tagseye-of-sahara
1 place carries this tag, across every kind and continent it appears in.
🇲🇷 Mauritania · Natural formation
Cretaceous 100 Ma formation; Atlantis proposed 9600 BCE · Natural geological; Atlantis = Plato allegory @ 360 BCE
Concentric circular erosional dome in Sahara (100 Ma igneous intrusion) promoted since 2018 YouTube as Atlantis capital matching Plato's ringed city.