Jošavka is the right and one of the largest tributaries of Vrbanja river, which flows into the Čelinac. Arises from two streams: Ćetina and Babića potok rising on the northeast slopes of the hill Tromeđa (404 m) in the foothills of the mountain massif of Uzlomac (1002 m). Right tributary of Jošavka river are: Stanikova rijeka, Mlinska rijeka (Mill River), Jelovaca, Mliješnica and Gozna and left: Jevđevića potok (Jevđevići's stream), the second comprises Prlišnica and Crna rijeka (Black river), and follow Baserovača, Repušnica and Balatin.