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) tribunals ruled in their favour. The Basque Government replaced it with an empty red field. Navarre is one of the historical Basque territories and even claimed by the Basque nationalists as the core of the Basque nation. There are also two enclaves surrounded by Basque territory—Treviño (Basque: "Trebiñu") and Valle de Villaverde (Basque: "Villaverde-Turtzioz")—which belong to the fellow neighbouring communities of Castile and León and Cantabria respectively, for which a legal connection to the Basque Country has become an on-off matter of political discussion. The Basque Autonomous Community ranks first in Spain in terms of per capita income, with a