The Crni Rzav (, ; Black Rzav), is the Rzav's longer headstream. It originates from the Čigota mountain, eastern section of the Zlatibor mountain. The river originally flows northward, next to the villages of Vodice and Jokina Ćuprija, reaches the central section of the Zlatibor where it is dammed and creates the artificial Ribnica lake (surface area of 10 km²), after the nearby village of Ribnica. After the lake, the river sharply turns west and soon gets followed by the parallel stream of the Jablanica river. After crossing the village of Mokra Gora (hamlet Panjak) on the Serbian-Bosnian border Crni Rzav meets the Jablanica river at the village Gornje Vardište and finally the river Beli Rzav at the village of Donje Vardište.