The Râul Negru (Hungarian: Feketeügy; literally meaning "Black River") is a left tributary of the river Olt in Romania.

[3] The Râul Negru flows through the villages Lemnia, Lunga, Catalina, Hătuica, Surcea, Telechia, Bita, Reci, Sântionlunca, Ozun, Băcel, Chichiș and Lunca Câlnicului.

[2] The following rivers are tributaries to the Râul Negru (from source to mouth):[2]

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