It originates from the northern side of the Veliki Maljenik mountain, in the Kučaj area of eastern Serbia.

It flows near the village of Krivi Vir and continues generally to the northeast, flowing through the Crnorečka kotlina (Црноречка котлина, "depression of Crna Reka"), populated with many smaller villages (Lukovo, Jablanica, Valakonje, Savinac, Gamzigrad, Zvezdan).

At Gamzigrad there is also an important archeological site from Roman times.

[2] Early in its course it receives from the right the Radovanska, Suva, Velika, Salešča, Šarbanovačka, Jasenova, Bajnska and Suva rivers and from the left the Velika Suvaja, Mirovska, Arnauta, Osnička.

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