Atlantis (Ancient Greek: Ἀτλαντὶς νῆσος, "island of Atlas") is a fictional island mentioned within an allegory on the hubris of nations in Plato's works Timaeus and Critias, where it represents the antagonist naval power that besieges "Ancient Athens", the pseudo-historic embodiment of Plato's ideal state. At the end of Plato's story, Atlantis falls out of favor with the gods and famously submerges into the Atlantic Ocean.

Athanasius Kircher's map of Atlantis, in the middle of the Atlantic Ocean. From Mundus Subterraneus 1669, published in Amsterdam. The map is oriented with south at the top.

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