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In Plato's account of Atlantis it is stated,"This great island lay over against the Pillars of Heracles (Straits of Gibraltar), in extent greater than Libya and Asia put together, and was the passage to other islands and to a great ocean of which the Mediterranean sea was only the harbor......" The misconception of the Americas being Asia lasted well into the naval age of around 1200 I believe. I think the "great island" was South America and the Caribbean Islands which were "other islands". Right up until Columbian discoveries of this area of the world was viewed as the West Indies. Which of course was another monumental ocean from there. I've postulated in another post my thoughts on a possible Atlantis with some pretty distinct evidence of cataclysm which would come into line with the story of, "young Phaethon who drove his father's horses the wrong way, and having burnt up the earth was himself burnt up by a thunderbolt." that, "Nine thousand years have elapsed since she founded yours, and eight thousand since she founded ours, as our annals record.' This would put the event near the Younger/Dryas epoch. 9000 years before Plato's account.
The problem with the speculation, so far, on the demise of Atlantis is to prove such a cataclysm occurred. Until that has a solid foundation the story of Atlantis will place it almost anywhere on the earth as you well know. This area of Tiwanaku, Bolivia has such evidence of a tsunami washing over the land 200 miles inland. There are saline lakes, like Lago Poopo and others littering the interior of Bolivia, Chile, Argentina and Peru. Saline lakes born from sea water covering the land at one moment in time. The more I bring this up to scholars out there the more interest and nods of possibility it brings into the picture.
I would be happy to forward some of the evidence I am suggesting about this possibility. It occurred out of the blue and not of a quest to find the lost civilization of Atlantis. The evidence did that on it's own.