SUSA, a fortified seaport of Northern Africa, Tunis, 40 miles S. of Hammamet, on the S.W. shore of the gulf of that name. It is, next to Tunis, the chief trading place in the country, contains several mosques and bazaars, manufactures of woollen and linen cloth, shoes, &c., and a good harbour, which receives the largest vessels. Pop. 10,500.