the river is fed by numerous tributaries from vlašić, čemernica, borja and uzlomac mountains. the most significant right-side tributaries are the bobovica, lopača, trnovac, crkvenica, stopanska rijeka, kruševica, jezerka, bosanka, and jošavka, and the most significant left-side tributaries, the čudnić, kovačevića potok, ćorkovac, demićka, sadika, grabovička rijeka, duboka river, vigošća/vigošta, cvrcka and jakotina.