The Mali Rzav (, Little Rzav) is the Rzav's shorter headstream. It originates from the northern slopes of the Mučanj mountain, near the village of Katići. Originally the river flows to the west, but at the village of Bjeluša it makes a large elbow turn, parallel to the even larger elbow turn of the Veliki Rzav. At the villages of Gornja Krušćica and Vranovina, the Mali Rzav straightens its course to the north and on the southern slopes of the Blagaja mountain meets the Veliki Rzav.