Passage 2.15.3
θύουσι δὲ Ἀργεῖοι τῷ Διὶ καὶ ἐν τῇ Νεμέᾳ καὶ Νεμείου Διὸς ἱερέα αἱροῦνται, καὶ δὴ καὶ δρόμου προτιθέασιν ἀγῶνα ἀνδράσιν ὡπλισμένοις Νεμείων πανηγύρει τῶν χειμερινῶν. ἐνταῦθα ἔστι μὲν Ὀφέλτου τάφος, περὶ δὲ αὐτὸν θριγκὸς λίθων καὶ ἐντὸς τοῦ περιβόλου βωμοί· ἔστι δὲ χῶμα γῆς Λυκούργου μνῆμα τοῦ Ὀφέλτου πατρός. τὴν δὲ πηγὴν Ἀδράστειαν ὀνομάζουσιν εἴτε ἐπʼ ἄλλῃ τινὶ αἰτίᾳ εἴτε καὶ ἀνευρόντος αὐτὴν Ἀδράστου· τὸ δὲ ὄνομα λέγουσι τῇ χώρᾳ Νεμέαν δοῦναι θυγατέρα Ἀσωποῦ καὶ ταύτην. καὶ ὄρος Ἀπέσας ἐστὶν ὑπὲρ τὴν Νεμέαν, ἔνθα Περσέα πρῶτον Διὶ θῦσαι λέγουσιν Ἀπεσαντίῳ. ---
The Argives sacrifice to Zeus also at Nemea, where they appoint a priest of Nemean Zeus, and indeed during the winter festival of the Nemea they hold a race for fully armed men. Here stands the tomb of Opheltes surrounded by a stone enclosure, and within this precinct there are altars; there is also an earthen mound—the monument of Lycurgus, the father of Opheltes. The spring is called Adrasteia, either for some other reason or because Adrastus himself discovered it. It is said that the region was named Nemea after another daughter of Asopus, who bore that name. Above Nemea rises Mount Apesas, where, it is said, Perseus first sacrificed to Zeus Apesantius.