Passage 8.21.1
ταῦτα μὲν δὴ οὕτω λέγουσι· τοῦ Λάδωνος δὲ τῶν πηγῶν ἀπέχει στάδια ἑξήκοντα ἡ Κλειτορίων πόλις, ἡ δὲ ὁδὸς ἡ ἀπὸ τῶν πηγῶν τοῦ Λάδωνός ἐστιν αὐλὼν στενὸς παρὰ τὸν Ἀροάνιον ποταμόν. πρὸς δὲ τῇ πόλει διαβήσῃ ποταμὸν καλούμενον Κλείτορα. ἐκδίδωσιν οὖν ὁ Κλείτωρ ἐς τὸν Ἀροάνιον, οὐ πλέον τῆς πόλεως σταδίους ἀπέχοντα ἑπτά.
These things indeed are related thus. The city of the Cleitorians is distant sixty stadia from the sources of the Ladon, and the road from the springs of the Ladon is a narrow valley along the river Aroanius. Near the city you will cross a river called Cleitor. The Cleitor empties into the Aroanius about seven stadia from the city.