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.