Ulassai, Ulàssai in sardinian language, is a comune (municipality) in the Province of Ogliastra in the Italian region Sardinia, located about 70 kilometres (43 mi) northeast of Cagliari and about 20 kilometres (12 mi) southwest of Tortolì. As of 31 December 2004, it had a population of 1,601 and an area of 122.2 square kilometres (47.2 sq mi).