PORTO-Longone, a small but very strong town of Italy, and in the isle of Elba, with a good harbour, and a fortress upon a rock almost inaccessible. The king of Naples has a right to put a garrison therein, though the place belongs to the prince of Piombino. It is seated on the east end of the island, eight miles south-west of Piombino. E. Long. 10. 10. N. Lat. 42. 52.