Wye Valley Wye Valley The Wye Valley Area of Outstanding Natural Beauty (AONB; ) is an internationally important protected landscape straddling the border between England and Wales. It is one of the most dramatic and scenic landscapes in Britain. The River Wye () is the fifth-longest river in the United Kingdom. The upper part passes through Rhayader, Builth Wells and Hay-on-Wye, but the area designated as an AONB covers surrounding a stretch lower down the river, from just south of Hereford to Chepstow. This area covers parts of the counties of Gloucestershire, Herefordshire and Monmouthshire, and is recognised in particular for its
England–Wales border then runs westwards to the River Teme, and follows the river southeastwards through Knighton before turning south towards the River Lugg at Presteigne, which is within Wales. The boundary continues southwards across hills to the River Wye, and follows the river upstream for a short distance to Hay-on-Wye, on the Welsh side of the border. It continues southwards and rises through and across the Black Mountains, following the Hatterall Ridge past Llanthony on the Welsh side and Longtown on the English side, to reach the River Monnow near Pandy. It then generally follows the river, past Pontrilas (in England) and