The Duchy of Schleswig (; ; Low German: Sleswig; North Frisian: Slaswik) was a principality in Southern Jutland (Sønderjylland) covering the area about 60 km north and 70 km south of the current border between Germany and Denmark; the territory has been divided between the two countries since 1920, with Northern Schleswig in Denmark and Southern Schleswig in Germany. The region is also called Sleswick in English.