PONTECORVO, a town of the Papal States, in an isolated district of the same name belonging to the province of Frosinone, but surrounded by the Neapolitan province of Terra di Lavoro, on the left bank of the Garigliano, 20 miles S.E. of Frosinone. It is the seat of a bishop, and has a mediæval castle, a cathedral, a fine bridge, and an hospital. In the vicinity there are some remains of the ancient Interamna. Pop. 5300.