Bosanska Krajina (Cyrillic: Босанска Крајина), pronounced [bɔ̌sanskaː krâjina]; sometimes translated as Bosnian Frontier) or, sometimes, simply just Krajina, is a geographical region, a subregion of Bosnia, in western Bosnia and Herzegovina enclosed by a number of rivers, namely the Sava (north), Glina (northwest), Vrbanja and Vrbas (east and southeast, respectively). The region is also a historic, economic and cultural entity of Bosnia and Herzegovina, famous for its natural beauties and wildlife diversity.
Bosanska Krajina is not a formal entity within the structure of Bosnia and Herzegovina; however it has a significant cultural and historical identity that was formed through several historic and economic events. The territory of Bosanska Krajina is currently divided between two entities of Bosnia and Herzegovina: Republika Srpska and the Federation of Bosnia and Herzegovina.
Between the 16th and 19th centuries, the territory between the Una and Vrbas rivers was referred to by the name Turkish Croatia. The name was first used consistently by Austrian military topographers who worked in the Austro-Ottoman border commission after the Treaty of Karlowitz of 1699. In the mid 19th century the name Turkish Croatia was replaced by cartographers in favor of Bosanska Krajina.