The Sirenusas (Italian: Le Sirenuse), also known as the Gallos (Li Galli, "the Cocks"), are an archipelago of little islands off the Amalfi Coast of Italy between Isle of Capri and 6 km (4 mi) southwest of Province of Salerno's Positano, to which it is administratively attached.
The archipelago consists of three main islands: Smaller islets include, nearer the shore, Isca and, midway between the main islands and Isca, a prominent rocky outcropping that juts above the water, Vetara [it].
They are mentioned in the 1st century BC by Strabo, the Greek Geographer and by Straton of Sardis in 120 AD.
Originally the site of an ancient Roman anchorage, in the Middle Ages the islands became medieval fiefdoms of the 13th-century Emperor Frederick II and the Capetian House of Anjou.
Isca has a villa and garden on the side facing the cliff (and, thus, not visible if sailing behind the island).