The Welsh River is a river located in Wales, United Kingdom. It is composed of four main rivers: the Taff (4 letters), Dee (3 letters), Usk (3 letters), and Wye (3 letters). The Taff is the longest river in Wales, running from the Brecon Beacons to Cardiff Bay. The Dee is the second longest river in Wales, running from Snowdonia to the Irish Sea. The Usk is the third longest river in Wales, running from the Brecon Beacons to the Severn Estuary. Finally, the Wye is the fourth longest river in Wales, running from the Cambrian Mountains to the Severn Estuary.