Tirrenide is the name given to a large landmass that was supposedly submerged off the west coast of Italy, which subsequently gave its name to the Tyrrhenian Sea. The name was first proposed by C.J. Forsyth Major in 1882.
Some commentators, such as Pier Paolo Cavallin and Evelino Leonardi, have tried to link the story with Atlantis. Von Klaproth speculated that it had been a vast island that filled most of the western Mediterranean. Others suggest the vicinity of Calabria or part of a landbridge between Italy and North Africa.