Passage 6.26.10
ταῦτα μὲν δὴ οὕτω λέγεται· ἀνδρὶ δὲ ἐς Ἀχαΐαν ἰόντι ἐξ Ἤλιδος ἑπτὰ καὶ πεντήκοντα στάδιοι καὶ ἑκατὸν ἐπὶ ποταμόν εἰσι Λάρισον, καὶ Ἠλείοις ὅροι πρὸς Ἀχαιοὺς τῆς χώρας ὁ ποταμός ἐστιν ἐφʼ ἡμῶν ὁ Λάρισος· τὰ δὲ ἔτι ἀρχαιότερα ἄκρα σφίσι πρὸς θαλάσσῃ ὅρος ἦν ὁ Ἄραξος.
These things, then, are said thus. For someone traveling into Achaia from Elis, it is one hundred and fifty-seven stadia to the river Larisos. In our time, the river Larisos serves as the boundary for the Eleans between their territory and that of the Achaeans, but in more ancient times their frontier by the sea had been the promontory Araxos.