Passage 9.24.5
ἐκ δὲ Κυρτώνων ὑπερβάλλοντι τὸ ὄρος πόλισμά ἐστι Κορσεία, ὑπὸ δὲ αὐτῷ δένδρων ἄλσος οὐχ ἡμέρων· πρῖνοι τὸ πολύ εἰσιν. Ἑρμοῦ δὲ ἄγαλμα οὐ μέγα ἐν ὑπαίθρῳ τοῦ ἄλσους ἕστηκε. τοῦτο ἀπέχει Κορσείας ὅσον τε ἥμισυ σταδίου. καταβάντων δὲ ἐς τὸ χθαμαλὸν ποταμὸς Πλατάνιος καλούμενος ἐκδίδωσιν ἐς θάλασσαν· ἐν δεξιᾷ δὲ τοῦ ποταμοῦ Βοιωτῶν ἔσχατοι ταύτῃ πόλισμα οἰκοῦσιν Ἁλὰς ἐπὶ θαλάσσῃ, ἣ τὴν Λοκρίδα ἤπειρον ἀπὸ τῆς Εὐβοίας διείργει.
After Kyrtones, as one crosses over the mountain, there is a small town called Korseia; at the foot of it is a grove of wild trees, mainly oaks. In the open air within the grove stands a rather small statue of Hermes. This lies at a distance of about half a stade from Korseia. As one descends to the plain, a river called Platanios flows into the sea. On the right side of this river dwell the inhabitants of Halai-on-the-Sea, the last settlement of the Boiotians here, where the Lokrian mainland is separated from Euboia.