Bosanska Krajina (Serbian Cyrillic: Босанска Крајина, pronounced [bɔ̌sanskaː krâjina]; sometimes translated as Bosnian Frontier) or simply 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.
The largest city, and its historical center is Banja Luka. Other cities include Bihać, Cazin, Velika Kladuša, Prijedor, Sanski Most, Gradiška, Kozarska Dubica, Bosanski Novi, Bosanska Krupa, Ključ, Bosanski Petrovac, Kotor Varoš, Šipovo, Mrkonjić Grad, Drvar, Bosansko Grahovo, Gornji Vakuf, Bugojno, Donji Vakuf, Jajce, Kneževo, Bužim, Laktaši, and Čelinac.