οὔσης τῆς πόλεως πρὸς λόφον

From LSJ

τὸ ἐγδοχῖον τοῦ ὕδατος καὶ τὰ ἐν τῆι πόλει ὑδραγώγια → the water reservoir and the conduits in the city (or on the acropolis)

Source

English > Greek (Woodhouse Quotes Reversed)

since the city lay on a slope