Subsequently considerable parts of the gorge have also been protected for their wildlife and habitats including the Cwm Clydach SSSI, Cwm Clydach National Nature Reserve, the Cwm Clydach Woodlands SAC and the Usk Bat Sites SAC which also extends across much of the neighbouring Mynydd Llangatwg.
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This early railroad was constructed during 1793-4 by the engineer John Dadford.
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