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Agios Stefanos (Greek: Άγιος Στέφανος meaning Saint Stephen) is a village and a community in the municipality West Achaea, Greece. It is located on both sides of the river Tytheus, 17 km southwest of Patras. The community includes the villages Palaia Peristera and Fylakes. Agios Stefanos is part of the municipal unit of Olenia.