Larissos is a former
municipality in
Achaea,
West Greece,
Greece. Since the 2011 local government reform it is part of the municipality
West Achaea, of which it is a municipal unit. Its seat of administration was in the village Lappas, part of the community
Metochi. The municipal unit was named after the river
Larissos, which flows through it. It is the westernmost municipal unit of Achaea, stretching along the
Ionian Sea coast and the border with
Elis to the southern part of the
Movri hills. It is about 32 km southwest of
Patras is 37and 50 km north of
Pyrgos.