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
Basque Country (autonomous community) into a separate autonomous community. Currently there is no official capital in the autonomous community, but the city of Vitoria-Gasteiz, in the province of Álava, is the de facto capital as the location of the Basque Parliament, the headquarters of the Basque Government, and the residence of the President of the Basque Autonomous Community (the Palace of Ajuria Enea). Whilst Vitoria-Gasteiz is the largest municipality in area, with 277 km (107 sq mi), Bilbao (or "Bilbo" in Basque) is the largest in population, with 353,187 people, located in the province of Biscay within a conurbation of 875,552 people. The term