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
Fishing industry in Greenland based on a referendum, in 1985 this was replaced with five year agreements with the EU. Although in the 1970s and early 1980s the halibut industry in Greenland was low scale, it has since dramatically increased since the 1980s and in the future may develop into a purely commercial venture for many native people in the country. Although the industry grew dramatically in the 1990s, by 2000 depletion of stocks resulted in falling revenues and the closure of many fishing plants. This problem continued into 2002. In 2000, Greenland renewed its agreement with the European Union in which along with