Passage 6.21.4
κατὰ ταύτην τὴν ἐπώνυμον τοῦ λῃστοῦ δειράδα ποταμὸς ἀπὸ μεσημβρίας κατιὼν ἐς τὸν Ἀλφειὸν καταντικρὺ τοῦ Ἐρυμάνθου μάλιστα, οὗτός ἐστιν ὁ τὴν Πισαίαν πρὸς Ἀρκάδας διορίζων, ὄνομα δέ οἱ Διάγων. τεσσαράκοντα δὲ ἀπὸ τῆς Σαύρου δειράδος προελθόντι στάδια ἔστιν Ἀσκληπιοῦ ναός, ἐπίκλησιν μὲν Δημαινέτου ἀπὸ τοῦ ἱδρυσαμένου, ἐρείπια δὲ καὶ αὐτός· ᾠκοδομήθη δὲ ἐπὶ τοῦ ὑψηλοῦ παρὰ τὸν Ἀλφειόν.
Near this ridge named after the bandit, a river called Diagon flows down from the south into the Alpheios, nearly opposite the Erymanthus; it forms the boundary between Pisa and Arcadia. About forty stades beyond Sauros ridge, one comes upon a sanctuary of Asclepius, surnamed Demainetos after its founder; this temple itself is also in ruins. It was built on a height overlooking the Alpheios.