Tritaia was named after the ancient Achaean city Tritaea, which was located near the present village Agia Marina.

Tritaia is situated in mountainous southern Achaea, on the border with Elis.

The Greek National Road 33 (Patras - Tripoli) runs through Tritaia.

The municipal unit Tritaia is subdivided into the following communities (constituent villages in brackets): According to Greek mythology, the city Triteia was founded by Melanippus, son of Ares and Triteia, daughter of the sea-god Triton.

The football clubs AO Tritaikos and Thyella Skiada both play on the dry field in Stavrodromi.