Lemuria

from Fancyclopedia 2

Originally an hypothetical [in paleontology] continent connecting India and Africa, it was taken over by the Theosophists and weird tellers, both of whom credit it with the origin of intelligent Earthly life; in the Lovecraft Mythos, for instance, Nyarlathotep began the human race when he took human form there. And "I Remember Lemuria!" was the yarn that kicked off the Shaver Mystery.