Lewis Short
Astŭra (noun M.f) : Ἄστυρα.
* A river in Asturia, now Esla, Flor. 4, 12, 54.
* A river (and , an island and town) in Latium, near which Cicero had a villa, Cic. Att. 12, 40; id. Fam. 6, 19; Liv. 8, 13; Plin. 3, 5, 9, § 57; cf. Mann. Ital. I. p. 620.
Charlton T. Lewis, Charles Short, A Latin Dictionary