The Federated States of Micronesia (FSM) is located in the western Pacific Ocean within the Carolinian archipelago. The four states consist of 607 islands with a total area of 7,866 sq km (3,037 sq mi), comprising 702 sq km (271 sq mi) of land, and 7,164 sq km (2,766 sq mi) of lagoons. Comparatively, the area occupied by the Federated States of Micronesia is slightly less than four times the size of Washington, D.C. Kosrae, the smallest and easternmost state, consists of five closely situated islands. Pohnpei consists of the single large island of Pohnpei and 25 smaller islands within a barrier reef, in addition to 137 outer islands, of which the major atolls are Mokil, Pingelap, Kapingamarangi, Nukjuoro, and Ngatik. Truk includes the large Truk lagoon, enclosing 98 islands, and major outer island groups, including the Mortlocks, Halls, Western, and Namwunweito islands. Yap, the westernmost state, consists of 4 large islands and 7 smaller islands surrounded by barrier reefs, in addition to 134 outer islands, of which the largest groups are Ulithi and Woleai. The cumulative coastline distance is 6,112 km (3,798 mi).
The capital city of the Federated States of Micronesia, Palikir, is located on the island of Pohnpei.