δι' ἐρημίας πολεμίων πορευόμενος → he marched on without finding any enemy, his route lay through a country bare of enemies
Sea of, ἡ Μαιῶτις (-ιδος) λίμνη.
Entrance to the Sea of Azov: Αὐλὼν Μαιωτικός, ὁ (Aesch., P. V. 731).