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Atlantis is a name for a fictional large island or small continent that supposedly had been in the Atlantic Ocean many years before it sank into the depth of the sea and vanished within a day and a night.
The name Atlantis first appears in the writings of Herodotus - he describes the western ocean as “Sea of Atlantis”. Then, one generation later, Atlantis is described in detail in the stories Timaeus and Critias by the Greek philosopher Plato. It is assumed that Plato used this story to help explain his ideas about government and philosophy. No other ancient writer have been known to write specific details about Atlantis except Plato.
After Plato, the idea of Atlantis was mostly forgotten until 1882, when a writer named Ignatius Donnelly wrote a book saying that Atlantis was real and that the culture of Atlantis had started many other ancient cultures, such as the Egyptian and Mayan.
By studying the types of rock that are found in the bottom of the Atlantic Ocean, scientists are sure that there was never really any large island or small continent there, so many people today think that Plato may have heard a story about another place and moved it to the Atlantic Ocean in his book.
Different people have thought that many places all over the world have been the place of the "real Atlantis".
It is also said that Atlantis sunk to the bottom of the ocean by the gods as punishment for its bad deeds and its inhabitants immorality.