Tramatza is a comune (municipality) in the Province of Oristano in the Italian region Sardinia, located about 100 kilometres (62 mi) northwest of Cagliari and about 12 kilometres (7 mi) northeast of Oristano. As of 31 December 2004, it had a population of 1,007 and an area of 16.8 square kilometres (6.5 sq mi).[3]