Border control is the implementation of border controls on travel between Svalbard, which maintains a policy of free migration as a result of the Svalbard Treaty (Norwegian: Svalbard-traktaten; ) and the Schengen Area, which includes the rest of Norway. The Kingdom of Denmark also maintains a complex system of subnational countries with autonomous customs policies, since they aren’t within the European Union like the Danish mainland. These are Greenland () and the Faroe Islands (). These areas do not maintain strict immigration controls with the Schengen Area, but border controls are sporadically enforced for customs purposes. Other examples of effective internal border
Autonomous administrative division 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