Bosanska Krajina is a geographical region, a subregion of Bosnia, in western Bosnia and Herzegovina. It is enclosed by a number of rivers, namely the Sava (north), Glina (northwest), Vrbanja and Vrbas. The region is also a historic, economic and cultural entity of Bosnia and Herzegovina, noted for its preserved nature and wildlife diversity.

Banja Luka or Banjaluka is the second largest city in Bosnia and Herzegovina and the largest city of Republika Srpska, of which it is also the de facto capital. Banja Luka is the traditional centre of the densely-forested Bosanska Krajina region of northwestern Bosnia. According to the 2013 census, the city proper has a population of 138,963, while its administrative area comprises a total of 185,042 inhabitants.