Aroania is situated in southeastern Achaea, near the border with Corinthia. The slightly higher Kyllini mountain is about 15 km to its east, separated from Aroania by the valley of the river Olvios. The mountain Erymanthos is about 30 km to the west, across the valley of the river Vouraikos. The rivers Krios, Krathis and Vouraikos drain the mountain towards the Gulf of Corinth in the north. The river Aroanios drains the mountain towards the southwest, to the Ionian Sea.