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) Country. In 2012, the proportion of Basques that identify themselves as Roman Catholic was 58.6%, while it is one of the most secularised communities of Spain: 24.6% were non-religious and 12.3% of Basques were atheist. Spanish and Basque are co-official in all territories of the autonomous community. The Basque-speaking areas in the modern-day autonomous community are set against the wider context of the Basque language, spoken to the east in Navarre and the French Basque Country. The whole Basque speaking territory has experienced both decline and expansion in its history. The Basque language experienced a gradual territorial contraction throughout the