Agosta, Or Angusta, a seaport town on the E. coast of Sicily, 12 m. X. of Syracuse, and 18 m. S. of Catania; pop. in 1861, 9,223. It is built on a low peninsula in the Mediterranean, and in consequence of its liability to earthquakes, by one of which it was almost totally destroyed in 1693, the houses, with a few striking exceptions, are built low. On the west side of the peninsula it has a commodious harbor, said to be one of the best in Sicily. The knights of Malta at one time had extensive magazines at this port. Agosta has a trade in wine, flax, olive oil, salt, honey, and sardines. The remarkable caves of Timpa are near the town. It was founded in the 13th century by the emperor Frederick II., who destroyed the town of Centuripa and removed its inhabitants hither.