Passage 4.34.1
ἐκ δὲ Μεσσήνης ὑπὸ τοῦ Παμίσου τὸ στόμα ὁδὸς μὲν σταδίων ἐστὶν ὀγδοήκοντα, ῥεῖ δὲ ὁ Πάμισος διά τε ἀρουμένης καὶ καθαρὸς καὶ ἀναπλεῖται ναυσὶν ἐκ θαλάσσης ἐπὶ δέκα που σταδίους· ἀναθέουσι δὲ ἐς αὐτὸν καὶ οἱ θαλάσσιοι τῶν ἰχθύων περὶ ὥραν μάλιστα τοῦ ἦρος. τὸ δὲ αὐτὸ ἐς Ῥῆνόν τε καὶ ἐς τὸν Μαίανδρον ποιοῦσιν οἱ ἰχθῦς· μάλιστα δὲ ἀνὰ τὸ ῥεῦμα τὸ Ἀχελῴου νήχονται τοῦ ἐκδιδόντος κατὰ νήσους τὰς Ἐχινάδας.
From Messene to the mouth of the Pamisos River is a journey of eighty stades. The Pamisos flows clearly through cultivated fields, and ships can sail up it from the sea for roughly ten stades. At the beginning of spring, the fish from the sea also swim upstream into it. Fish behave similarly in the Rhine and the Maeander rivers, but particularly in the current of the Acheloos, which empties into the sea by the Echinades islands.