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nomos (department) and historic region of Greece on the north coast of the Peloponnese, south of the Gulf of Corinth. In ancient times it was bounded on the west by Elis (modern Ilia), on the south by Mount Erymanthus and Arcadia, and on the east by Sicyon (modern Sikion). The hilly coastal region almost corresponds to the modern nomos of Akhaia, whose administrative capital is Patrai, although the eastern boundary now falls west of Mount Kyllene (Killini Oros). The highway and railway from Athens to Patrai follow the north coast of the Peloponnese.