The Pacific Islands comprise 20,000 to 30,000 islands in the Pacific Ocean. The islands are also sometimes collectively called Oceania, although Oceania is sometimes defined as also including Australasia and the Malay Archipelago.
The region's islands are classified into two groups, high islands and low islands. Volcanoes form high islands, which generally can support more people and have a more fertile soil. Low islands are reefs or atolls, and are relatively small and infertile. Melanesia, the most populous of the three regions, contains mainly high islands, while most of Micronesia and Polynesia are low islands. In addition, there are many other islands located within the boundaries of the Pacific Ocean that are not considered part of Oceania. These islands include the Galápagos Islands of Ecuador; the Aleutian Islands in Alaska, United States; the Russian islands of Sakhalin and Kuril Islands; Taiwan and other islands of the Republic of China; the Philippines; islands in the South China Sea, which includes the disputed South China Sea Islands; most of the islands of Indonesia; and the island nation of Japan, which comprises the Japanese Archipelago.
Wallis and Futuna, officially the Territory of the Wallis and Futuna Islands (French: Wallis et Futuna or Territoire des îles Wallis et Futuna, Fakauvea and Fakafutuna: Uvea mo Futuna), is a French island collectivity in the South Pacific between Tuvalu to the northwest, Rotuma of Fiji to the west, the main part of Fiji to the southwest, Tonga to the southeast, Samoa to the east, the New Zealand-associated state of Tokelau to the northeast and to a more distant north the Phoenix Islands (Kiribati). Wallis and Futuna is not part of, nor even contiguous with, French Polynesia. Wallis and Futuna is located at the very opposite western end of Polynesia.
Its land area is 264 km2 (102 sq mi) with a population of about 15,000. Mata-Utu is the capital and biggest city. The territory is made up of three main volcanic tropical islands along with a number of tiny islets, and is split into two island groups that lie about 260 km (160 mi) apart, namely Wallis Islands (Uvea) in the northeast, and Hoorn Islands (also called the Futuna Islands) in the southwest, including Futuna Island proper and the mostly uninhabited Alofi Island.