TERRACINA (anc. Anxur, or Tarracina), a town of the Papal States, at the S.E. extremity of the Pontine marshes, near the border of the kingdom of Naples, about 56 miles S.E. of Rome. The ancient Anxur, whose site is occupied by the present old town, stood, as ancient writers inform us, on calcareous rocks, widely conspicuous for their white colour, forming the termination of the Monti Lepini, the ancient Volscian Mountains. At the foot of these rocks, and close upon the sea-shore, ran the Via Appia, still the high-road between Rome and Naples. Along it has been built the more modern portion of the town, consisting chiefly of inns, custom-houses, and other public offices. The most conspicuous building in Terracina is the cathedral, with its lofty spire; there is also an elegant episcopal palace, and above the town, on the summit of the overhanging cliff, are the remains of the palace of Theodoric. The ancient harbour, constructed by Antoninus Pius, has long been completely silted up; but there is still some fishery here and a little trade. Anxur was the name of the town while it was subject to the Volscians; but after the Romans conquered it, about 400 B.C., they gave it the name of Tarracina. It was a place of importance in the later times of the republic and under the empire. Pop. 4145.