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The Turkish historian Hasan Umur (1880-1977) describes Ancomah as a mythological city near modern Trabzon on the Black Sea. It is one of many sites sometimes considered as a possible location for Plato's Atlantis. Ancomah is part of Turkish folklore.
According to local tales, Ancomah was a wealthy coastal community until it lost significance with the appearance of the Bosphorus. A lake in the vicinity is supposedly hiding ancient treasures.
There is no evidence that the city ever existed.