The Ugar (Brzica until 1878[1]) is a river of Bosnia and Herzegovina. It is a tributary of the Vrbas river.
The Ugar's length is around 44.5 kilometres. Its drainage basin is around 328 km2. Its largest right tributaries are: Pljačkovac, Ilomska, Kobilja, Zirin Potok and Kusin Potok (Ziro's and Kuso's creeks). The left tributaries are the creeks: namely Lužnica Potok, Dedića Potok, Andrijevića Potok, Bunar, Oraški Potok, and Kukavički Potok.[2][3]
It starts at the slopes of Vlašić, upstream of Sažići and Melina villages. This is around 1590 meters above sea level. It is a watershed area of Vrbanja, Ilomska and Bila rivers. Its discharge is 6.98 m3/s (246 cu ft/s) [4]