The River Taff (Welsh: Afon Taf) is one of Wales' most remarkable fishing success stories — a river that once ran black with industrial pollution and now flows as a productive game fishery from its headwaters in the Brecon Beacons all the way to its mouth at the Bristol Channel in Cardiff. Rising as two separate rivers, the Taf Fechan ("little Taff") and the Taf Fawr ("great Taff"), the river forms its main channel just north of Merthyr Tydfil before winding southward through the South Wales valleys. What was once described in an 1872 report as "uninhabitable to fish" is today a thriving trout and grayling river, with migratory salmon and sea trout also making their way through the lower reaches. The transformation is a testament to decades of conservation effort, improved water quality, and dedicated management by local angling clubs.