SAN SEBASTIAN, a seaport of Spain, capital of Guipuzcoa, one of the Basque provinces, on the shore of the Bay of Biscay, 42 miles N.N.W. of Pamplona. It occupies a narrow isthmus, terminated towards the north by a conical rock 400 feet high, called Urgull or Orgollo, and flanked on one side by the river Urumea, which is crossed by a bridge, and on the other by a bay, which forms the harbour. The summit of the hill is occupied by a fort, with five fronts, and the landward side of the town is defended by solid ramparts, with a bastion in the centre. The houses are almost all modern, built uniformly in straight streets and regular squares, so as to present an appearance quite unlike most Spanish towns. There are two large irregular churches, a handsome court-house, a nunnery, theatre, hospitals, barracks, &c. The manufactures of the place are insignificant; and the harbour is small, and not easily accessible, though well protected by a mole and small island. There is a considerable trade in English and French goods, corn and other articles being exported. From its position and strength, San Sebastian has been long a place of much importance, and has sustained several sieges. The most memorable of these was in 1813, when the British, under Wellington, took it by storm. Pop. 10,036.