Torre Astura, formerly an island called by the ancients merely Astura, is now a peninsula in the comune of Nettuno, on the coast of Latium, Italy, at the southeast extremity of the Bay of Antium, on the road to Circeii. The name also belongs to a medieval coastal tower in the same site, as well as to the river which rises at the southern foot of the Alban Hills, and has a course of about 33 km before flowing into the sea immediately to the southeast.
It was called Storas by Strabo, who tells us that it had a place of anchorage at its mouth. It was on the banks of this obscure stream that was fought, in 338 BCE, the last great battle between the Romans and the Latins, in which the consul Gaius Maenius totally defeated the combined forces of Antium, Lanuvium, Aricia and Velitrae. At a much later period the little island at its mouth, and the whole adjacent coast, became occupied with Roman villas; among which the most celebrated is that of Cicero, to which he repeatedly alludes in his letters, and which he describes as locus amoenus et in maria ipso, commanding a view both of Antium and Circeii, and to which he retired on the death of his daughter Tullia in 45 BCE.