Prefecture of Achaea

Achaea (Greek: Ἀχαΐα, Achaïa) is an ancient province and a present prefecture of Greece, on the northern coast of the Peloponnese, stretching from the mountain ranges of Erymanthus and Cyllene on the south to a narrow strip of fertile land on the north, bordering the Gulf of Corinth, into which the mountain Panachaicus (1,902 m, the northernmost mountain range in the Peloponnese) projects.

Achaea is bounded on the west by the territory of Elis, on the east by that of Sicyon, which, however, was sometimes included in it. The population in 2001 had reached over 300,000.