While the FSM's total land area is quite small, amounting to approximately 270 square miles (700 km), it occupies more than 1,000,000 square miles (2,600,000 km) of the Pacific Ocean. The capital is Palikir, the largest city Kolonia, both on Pohnpei.Each of its four States is centered around one or more main high islands, and all but Kosrae include numerous outlying atolls. The Federated States of Micronesia is spread across part of the Caroline Islands in the wider region of Micronesia, which consists of thousands of small islands divided between several countries. The term Micronesia may refer to the Federated States or to the region as a whole. The FSM was formerly a part of the Trust Territory of the Pacific Islands (TTPI), a United Nations Trust Territory under U.S. administration, but formed its own constitutional government on May 10, 1979, so becoming a sovereign state after independence was attained on November 3, 1986 under a Compact of Free Association with the United States. Other neighboring island entities, and also former members of the TTPI, formulated their own constitutional governments and became the Republic of the Marshall Islands (RMI) and the Republic of Palau (ROP). The FSM has a seat in the United Nations.