Vrbas (river)
Vrbas starts from two springs on Ze Mountain (branch of Vranica), at 1715 m above sea level. Vrbas River cuts a composite valley, passing through Skopljanska valley, Vinačka klisura (gorge), Jajce valley, canyon valley Tijesno, Banja Luka valley, and a lower flow through  Lijevče polja (field).