The Vrbanja is a river in western Bosnia and Herzegovina; with Ugar, the largest right tributary of the Vrbas. Its basin covers an area of approximately 703.5 km2. It has a significant hydropower potentials. There are many different estimations of the Vrbanja's length, from 84 km to 95.4 km.
Like as many sites in Bosnia, and Vrbanja is named after the willows that grow along the river from Kruševo Brdo to Banja Luka. In the same way are called many localities in Bosnia: Vrbanjci village and Vrbanja, near Banja Luka, as well as Vrbas and a bridge in the center of Sarajevo (which is known after crimes that occurred during the defense of besieged City, 1992-1995).
The Vrbanja source is on the slopes of Vlašić Mountain, upstream of Pilipovina village (at around of 1,530 meters above sea level). The area around the source is called "Prelivode" many confluences of the Ugar, Ilomska and Bila rivers, with a radius of around 2-3 kilometers. Prelivode is on a ridge between Mountains Vlašić (1933 m) and Meokrnje (1425 m). On this location are riverhead many confluences of Vrbanja, Ugar and Lašva basins (i.e. Vrbas, at southwest) and Usora (i.e. Bosna on northeast).
Vrbanja may refer to:
Vrbanja (Serbian: Врбања) is a village in the municipality of Bugojno, Bosnia and Herzegovina.
Coordinates: 44°01′39″N 17°27′55″E / 44.0275°N 17.4653°E / 44.0275; 17.4653
Vrbanja is a suburban village and local community in Banja Luka, Republika Srpska, Bosnia and Herzegovina, about 6 kilometres (3.7 mi) south-east of the city's center. Until 1971, it was officially a separate inhabited place. Then it came to be the part of the settlement of Banja Luka – today the City of Banja Luka.
Through Vrbanja passes the Vrbanja River (after which the settlement was named) and two major lines of communication: the Banja Luka – Doboj railway line and the M4 highway (Banja Luka – Kotor Varoš – Doboj).
In addition to the eponymous Vrbanja River, the natural resources of the settlement include the numerous natural springs of drinking water that are found in the surrounding hills.
After the history of Medieval Bosnia and the earlier period, it can be concluded that in this area, there was a very old village. It was located about 500 meters north of the present-day village. The tradition which has been preserved among today's population suggest that the former settlement was organized on the principle of rural cooperatives.