Passage 8.38.10
τὸν μέν γε ἐπὶ τὰς Ἐχινάδας κατιόντα Ἀχελῷον διὰ τῆς Ἀκαρνάνων καὶ διʼ Αἰτωλίας ἔφησεν ἐν Ἰλιάδι Ὅμηρος ποταμῶν τῶν πάντων ἄρχοντα εἶναι, ἕτερον δὲ Ἀχελῷον ῥέοντα ἐκ Σιπύλου τοῦ ὄρους ἐποιήσατο αὐτόν τε τὸν ποταμὸν καὶ τὸ ὄρος τὸν Σίπυλον τοῦ λόγου προσθήκην τοῦ ἐς Νιόβην· τρίτῳ δʼ οὖν καὶ τῷ περὶ τὸ ὄρος τὸ Λύκαιόν ἐστιν ὄνομα Ἀχελῷος.
Indeed, Homer in the Iliad said that the Achelous river, flowing toward the Echinades islands through Acarnania and Aetolia, is leader over all rivers. However, he created another Achelous, flowing from Mount Sipylus; both this river and Mount Sipylus were added to the account of Niobe. There is also yet a third river called by the name Achelous around Mount Lycaeus.