|Basin countries||Bosnia and Herzegovina|
|Basin area||Black Sea|
The Vrbas (Cyrillic: Врбас) is a major river with a length of 235 km, in western Bosnia and Herzegovina. It is a right tributary of the Sava river. The city of Banja Luka is located on the river banks.
The word vrba means "willow" in Bosnian/Croatian/Serbian, and a number of weeping willow trees adorn the river banks in Banja Luka.
It is a right tributary of the river Sava. The Vrbas river appears at the southern slope of the Vranica mountain near the town of Gornji Vakuf, at around 1530 meters above sea level and it drains central part of the northern slopes of the Dinaric mountain massif. It empties into the Sava river at around 90 meters above sea level. Total length of the main watercourse is around 235 km.
Average annual rainfall is around 800 l/m2 at the mouth of the Vrbas to the Sava river and up to 1500 l/m2 in the southern part of the basin. Characteristic mean flow is around 34,6 l/s/km2 Maximum rainfall occurs in the southern parts of the Vrbas basin in the late autumn and winter months, with minimum quantities in summer, whereas the northern parts of the basin receive the largest quantities of rain during the summer months (June–July), with the maximum in November and December. The most important tributaries are the Desna river, the Pliva, the Ugar river, the Crna Rijeka river and the Vrbanja river which are located in the middle part of the basin.
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