Olenia () is a municipal unit of the municipality of West Achaea in the Peloponnese peninsula of Greece. Until the 2011 local government reform, it was a separate municipality with the village of Lousika as its seat. It covers an area of 189.534 km2 and has a population of 4,303 according to the 2021 census. Olenia is named after the ancient Achaean town of Olenus.
Subdivisions The municipal unit Olenia is subdivided into the following communities (constituent villages in brackets): Achaiko Agios Nikolaos Kralis (Kalamaki, Agios Nikolaos, Avgeraiika, Thomaiika, Poimenochori) Agios Stefanos (Agios Stefanos, Palaia Peristera, Fylakes) Ano Soudenaiika Arla Chaikali (Chaikali, Katsaitaiika, Kounelaiika) Charavgi (Charavgi, Neochori, Pigadia) Flokas (Flokas, Zisimaiika) Fostaina Galanaiika Gkaneika Kato Mazaraki Lousika (Lousika, Spaliaraiika, Ypsili Rachi) Mitopoli (Mitopoli, Komi, Souvaliotaiika) Portes Santomeri (Santomeri, Ampelakia, Polylofo)
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