The River Duff, or Bunduff, (Irish: An Dubh, meaning "the black") is a river in County Sligo and County Leitrim, Ireland. The River Duff is 14 miles (23 km) long, flowing from Glenade Valley in County Leitrim to the sea. In County Leitrim it is also known as the Black River. It is joined by the Ballanaghtrillick River, which runs out of the Horseshoe Pass.
The Duff River is good for beginner white-water rafters, kayakers, and the like, with approximately 500 metres of class 2/3 rapids and a three metre (10 feet) drop at the end. As it is a short, mountain river, draining the Dartry Mountains and the Ben Bulben, water levels are known to change very quickly, after heavy rain.
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YouTube videos of the River Duff