Passage 8.1.2
τὰ δὲ πρὸς Λεχαίου Κορινθίοις Σικυώνιοι προσοικοῦσιν ἔσχατοι ταύτῃ μοίρας τῆς Ἀργολίδος· μετὰ δὲ Σικυῶνα Ἀχαιοὶ τὸ ἐντεῦθέν εἰσιν οἱ παρὰ τὸν αἰγιαλὸν οἰκοῦντες· τὸ δὲ ἕτερον Πελοποννήσου πέρας τὸ ἀπαντικρὺ τῶν Ἐχινάδων οἰκοῦσιν Ἠλεῖοι· τῆς δὲ γῆς τῆς Ἠλείας κατὰ μὲν Ὀλυμπίαν καὶ τοῦ Ἀλφειοῦ τὰς ἐκβολὰς πρὸς τὴν Μεσσηνίαν εἰσὶν ὅροι, τὰ δὲ πρὸς Ἀχαΐαν Δυμαίων εἰσὶν ὅμοροι.
Next to Lechaeum, the Sicyonians are neighbors of the Corinthians, being at this point the farthest settlement within the region of Argolis. Beyond Sicyon, along the coast, dwell the Achaeans. At the opposite boundary of the Peloponnese, directly facing the islands of Echinades, are the Eleans. Concerning the land of Elis, its boundaries toward Messenia are situated near Olympia and the outlets of the Alpheius; toward Achaia, the Eleans border upon the territory of Dyme.