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 is estimated to be more than 50%; contribution to gross national income of the country is reported to be as high as 20%. The fish that dominate the Greenlandic fishing industry are mainly shrimps, cod, halibut and salmons. They are caught and processed in Greenland and then are sold, often exported in frozen cans. The center of the fishing industry lies in the south of the country, the main hub is in Disko Bay in the southwest. Greenland’s entry into the market of European Union was in 1972. This was considered as harmful to the interests of Greenland, and eventually,