Lost Lands

Lost lands are islands or continents believed by some to have existed during pre-history, but to have since disappeared as a result of catastrophic geological phenomena. Such continents are generally thought to have subsided into the sea, leaving behind only a few traces or legends by which they may be known.
Legends of lost lands often originated as scholarly or scientific theories, only to be picked up by writers and individuals outside the academy. Occult and New Age writers have made use of Lost Lands, as have subaltern peoples such as the Tamils in India.
Phantom islands, as opposed to lost lands, are land masses formerly believed by cartographers to exist in the current historical age, but to have been discredited as a result of expanding geographic knowledge.
The classification of lost lands as continents, islands, or other regions is in some cases subjective; for example, Atlantis is variously described as either a "lost island" or a "lost continent". Lost land theories may originate in mythology or philosophy, or in scholarly or scientific theories, such as catastrophic theories of geology.
-https://en.wikipedia.org/wiki/List_of_lost_lands
Category:Civilization