SUSA, a town of the kingdom of Sardinia, capital of a province, in the division and 37 miles W. of Turin, in a valley on the right bank of the Dora Riparia. It consists of an old and a new town, both somewhat irregularly laid out, although the latter has some handsome streets and squares. Here are a cathedral, town-hall, college, several schools, hospitals, convents, &c. There are also some remains of antiquity, including a Roman triumphal arch, and the ruins of the castle La Brunetta, on a steep height, 11,000 feet above the sea. Pop. 3500.