Oceania, officially the Oceanian Republic, is a republic located in the region of Oceania in the South Pacific Ocean. Oceania is divided into the subregions of Melanesia, Micronesia, and Polynesia. Oceania is a union of constituent states. It consists of: Fiji, the Solomon Islands, and Vanuatu in Melanesia; the Federated States of Micronesia, Kiribati, the Marshall Islands, Nauru, and Palau in Micronesia; and Samoa, Tonga, and Tuvalu in Polynesia.