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
Greenland–European Union relations speculation as to whether Greenland might consider rejoining the European Union, although this seems highly unlikely to occur any time soon. On 4 January 2007, the Danish daily "Jyllands-Posten" quoted the former Danish minister for Greenland, Tom Høyem, as saying "I would not be surprised if Greenland again becomes a member of the EU ... The EU needs the Arctic window and Greenland cannot alone manage the gigantic Arctic possibilities". The debate has been reignited in light of the 2008–2011 Icelandic financial crisis. The EU Common Fisheries Policy is an important reason why Greenland, Norway and Iceland stay outside the