​WYE, a river of South Wales, which, rising from Montgomeryshire, near the Severn's source, and flowing generally S. E. between Radnor and Brecon, through Hereford, and between Gloucester and Monmouth, enters the Severn at Chepstow, 123 miles below its head. Rapid and rockbound as far as Hay, the Wye grows gentler as it gathers volume, but throughout is singularly beautiful, making innumerable horseshoe curves between wooded banks, and passing by Maeslough, Clifford, Gooderich, and Chepstow Castles, Hereford Cathedral, and Tintern Abbey.