Passage 8.7.2
ἀφανισθὲν δὲ ἐνταῦθα ἄνεισι κατὰ τὴν Δίνην· ἔστι δὲ ἡ Δίνη κατὰ τὸ Γενέθλιον καλούμενον τῆς Ἀργολίδος, ὕδωρ γλυκὺ ἐκ θαλάσσης ἀνερχόμενον. τὸ δὲ ἀρχαῖον καὶ καθίεσαν ἐς τὴν Δίνην τῷ Ποσειδῶνι ἵππους οἱ Ἀργεῖοι κεκοσμημένους χαλινοῖς. γλυκὺ δὲ ὕδωρ ἐν θαλάσσῃ δῆλόν ἐστιν ἐνταῦθά τε ἀνιὸν ἐν τῇ Ἀργολίδι καὶ ἐν τῇ Θεσπρωτίδι κατὰ τὸ Χειμέριον καλούμενον.
After disappearing here, it re-emerges at the Dine spring. The Dine is located by the place called Genethlion in Argolis, and is fresh water that rises from the sea. In ancient times, the Argives used to offer horses adorned with bridles to Poseidon by sending them down into the Dine. This phenomenon of fresh water emerging in the sea is clearly evident at this spot in Argolis, and also in Thesprotia near the place called Cheimerion.