The Željeznica is a river in Bosnia and Herzegovina. The river Željeznica rises at the foot of the Treskavica Mountain, in the beautiful and attractive forest ambiance, has a number of rapids and whirlpools. There, on Željeznica River, upstream from Turovi Village, is a beautiful and rare natural phenomenon, the kettles on Željeznica. Kazani is the most attractive place in the Canyon. This is the place where the River, over centuries of strong running and carrying material, has scooped round hollows, kettles, that observers get the impression water boils in. The kettles are about half to one meter deep and 0,30 to 0,70 cm wide in radius, and they are frequent in the riverbed.