Eretria

A city on the island of Euboia (Euboea).

During the Trojan War, Elephenor commanded the long-haired Abantes from Euboia, which included Achaian (Achaean) soldiers from Eretria, Karystos (Carystus), Kerinthos (Cerinthus), Chalkis (Chalcis), Dion, Histiaia (Histiaea), and Styra.

Latitude North, Longitude East
38.3939, 23.7933

References:
Homer, Iliad book 2, line 537