The River Taff (Welsh: Afon Taf) is a river in Wales. It rises as two rivers in the Brecon Beacons; the Taf Fechan (little Taff) and the Taf Fawr (great Taff) before becoming one just north of Merthyr Tydfil. Its confluence with the River Severn estuary is in Cardiff.
The river supports several species of migratory fish, including salmon, sewin (sea trout), and eel.
