Bosanska Krajina (Serbian Cyrillic: Босанска Крајина, pronounced [bɔ̌sanskaː krâjina], lit. 'Bosnian Frontier') is a geographical region, a subregion of Bosnia, in western Bosnia and Herzegovina. It is enclosed by several 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, noted for its preserved nature and wildlife diversity.
The largest city and historical center of the region is Banja Luka. Other cities and towns include Bihać, Bosanska Krupa, Bosanski Petrovac, Čelinac, Bosansko Grahovo, Bužim, Cazin, Drvar, Gradiška, Ključ, Kostajnica, Kozarska Dubica, Kneževo, Kotor Varoš, Laktaši, Mrkonjić Grad, Novi Grad, Prijedor, Sanski Most, Šipovo, Velika Kladuša, and Prnjavor.