Lake Ozeros (Greek: Οζερός, Λίμνη Οζερού) is a lake located west of Agrinio. The lake is formed from the waters of the Acheloos river, flowing from the northwest. The lake has a surface of ca. 10 km2 and an average depth of 8–10 m, but this varies greatly with the season. The GR-5/E55 (Antirrio - Agrinio - Ioannina) runs to the northeastern side.