Island
An island or isle is any piece of sub-continental land that is surrounded by water. Very small islands such as emergent land features on atolls can be called islets, skerries, cays or keys. An island in a river or a lake island may be called an eyot or ait, and a small island off the coast may be called a holm. A grouping of geographically or geologically related islands is called an archipelago, such as the Philippines.
Autonomous administrative division
An autonomous administrative division (also referred to as an autonomous area, entity, unit, region, subdivision, or territory) is a subdivision or dependent territory of a country that has a degree of self-governance, or autonomy, from an external authority. Typically, it is either geographically distinct from the rest of the country or populated by a national minority. Decentralization of self-governing powers and functions to such divisions is a way for a national government to try to increase democratic participation or administrative efficiency or to defuse internal conflicts. Countries that include autonomous areas may be federacies, federations, or confederations. Autonomous areas can be divided into territorial autonomies, subregional territorial autonomies, and local autonomies.Jersey, Guernsey, and the Isle of Man are self-governing Crown dependencies which are not part of the United Kingdom; however, the UK is responsible for their defence and international affairs. Gibraltar is a self-governing overseas territory of the UK. Most of the other 13 British Overseas Territories also have autonomy in internal affairs through local legislatures.New Zealand maintains nominal sovereignty over three Pacific Island nations. The Cook Islands and Niue are self-governing countries in free association with New Zealand that maintain some international relationships in their own name. Tokelau remains an autonomous dependency of New Zealand. The Chatham Islands—despite having the designation of "Territory"—is an integral part of the country, situated within the New Zealand archipelago. The territory's council is not autonomous and has broadly the same powers as other local councils, although notably it can also charge levies on goods entering or leaving the islands.Aruba, Curaçao, and Sint Maarten are autonomous countries within the Kingdom of the Netherlands, each with their own parliament. In addition they enjoy autonomy in taxation matters as well as having their own currencies.The French constitution recognises three autonomous jurisdictions. Corsica, a region of France, enjoys a greater degree of autonomy on matters such as tax and education compared to mainland regions. New Caledonia, a "sui generis" collectivity, and French Polynesia, an overseas collectivity, are highly autonomous territories with their own government, legislature, currency and constitution. They do not, however, have legislative powers for policy areas relating to law and order, defense, border control or university education. Other smaller overseas collectivities have a lesser degree of autonomy through local legislatures. The five overseas regions, French Guiana, Guadaloupe, Martinique, Mayotte and Réunion, are generally governed the same as mainland regions; however, they enjoy some additional powers, including certain legislative powers for devolved areas.