HELLAS, (anc. geog.), an appellation comprising, according to the more ancient Greeks and Romans, Achaea and Peloponnese, but afterwards restrained to Achaea. It was bounded on the west by the river Achelous, on the north by mounts Othrys and Oeta, on the east by the Egean sea, and on the south by the Saronic and Corinthian bays, and by the isthmus which joins it to Peloponnese. It was called Hellas, from Hellus the son of Deucalion; or from Hellas, a district of Thessaly; whence Hellenes, the gentilicious name, denoting Greeks. Now called Livadia.