Achelous River
…Dolopians and Agraeans, entered the plain of Acarnania and Aetolia near Stratus, and discharged itself into the Ionian Sea, near the Acarnanian town of Oeniadae. It subsequently formed the boundary between Acarnania and Aetolia, but in the time of Thucydides the territory of Oeniadae extended east of the river…