Passage 10.11.4
τούτων Λιπάραν μὲν κτίσαντες πόλιν ἐνταῦθα οἰκοῦσιν, Ἱέραν δὲ καὶ Στρογγύλην καὶ Διδύμας γεωργοῦσι διαβαίνοντες ναυσὶν ἐς αὐτάς. ἐν δὲ τῇ Στρογγύλῃ καὶ πῦρ δῆλόν ἐστιν ἀνιὸν ἐκ τῆς γῆς· καὶ ἐν Ἱέρᾳ δὲ πῦρ τε αὐτόματον ἐπὶ ἄκρας ἀνακαίεται τῆς νήσου καὶ ἐπὶ θαλάσσῃ λουτρά ἐστιν ἐπιτήδεια, εἰ δέξεταί σε ἠπίως τὸ ὕδωρ, ἐπεὶ ἄλλως γε χαλεπὸν ὑπὸ ζεστότητός ἐστιν ἐμβαίνεσθαι.
After founding a city on Lipara, they now dwell there, while they cultivate Hiera, Strongyle, and Didyma by sailing over to them in ships. On Strongyle there is clearly visible a fire which rises up from the earth; and on Hiera an automatic fire blazes forth on the summit of the island, where by the sea there are baths suitable for bathing, provided the water accepts you gently, as otherwise it is difficult to enter because of its heat.