Mu

Mu was a continent alleged to have existed on Earth.

Franz Kryptosa wrote the book In Search of Ancient Mu about it but Bernice Summerfield noted that he seemed to have gotten it confused with Atlantis. (BNA: Ship of Fools) Whether it existed or not, the Museum of Things That Don't Exist included an inaccurate model of it along with Atlantis and Hyperborea. (EDA: The Taking of Planet 5)