The Northern Mariana Islands, officially the Commonwealth of the Northern Mariana Islands (CNMI), is an unincorporated territory and commonwealth of the United States consisting of the 14 northern islands of the Mariana Archipelago in the northwestern Pacific Ocean. The southernmost, Guam, is a separate U.S. territory. The Northern Mariana Islands were listed by the United Nations as a non-self-governing territory until 1990.