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The River Clydach is a short, steep and fast-flowing river in Monmouthshire and the county borough of Blaenau Gwent in south Wales. It lies within the Brecon Beacons National Park. It is around 10 kilometres (6 mi) in length.
Map of River Clydach, United Kingdom
The river rises on the southern slopes of Mynydd Llangatwg (51.8122°N 3.1939°W / 51.8122; -3.1939 (River Clydach, source)) then heads south-east through Clydach Dingle past Brynmawr. It then enters the spectacular Clydach Gorge, dropping about 300 metres (1,000 ft) to Gilwern and its confluence with the River Usk (51.8329°N 3.1007°W / 51.8329; -3.1007 (River Clydach, mouth)).
"Clydach" is a common name for watercourses in south Wales and is thought to derive from an old Welsh word for "swift" or possibly "stoney", both of which would apply in this case.