ὅσον ἀπὸ τοῦ ἱεροῦ ἐφεωρᾶτο τῆς νήσου → as much of the island as was in view from the temple
praerupte: a false read. for praealtus, Plin. 34, 15, 43, § 149; v. Sillig ad h. l.
praerupte. adv. :: Mons — altus 巉峻之山。