The Buhui is a left tributary of the river Caraș (Karaš) in Romania. It discharges into the Caraș upstream from Carașova. Its length is and its basin size is . The river first flows through Lake Buhui. Thereafter it flows through the Buhui Cave and, after emerging from the cave, flows through a reach of narrow gorges in the Semenic-Cheile Carașului National Park before joining the Caraș.
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