Hay-on-Wye the north-easternmost tip of the Brecon Beacons National Park, just north of the Black Mountains. The town is just on the Welsh side of the border with Herefordshire, England, here defined by the Dulas Brook. Where the brook joins the River Wye just north of the town, the border continues northwards along the river. The Wye was the boundary between the former counties and districts of Radnorshire and Brecknockshire. The adjacent village of Cusop lies on the English side of the Dulas Brook. The nearest city is Hereford, county town of Herefordshire, some to the east. The Royal Mail depot
River Wye, Buckinghamshire River Wye, Buckinghamshire The River Wye is a river in Buckinghamshire, England. Around in length, it rises in the Chiltern Hills and flows through High Wycombe before emptying into the River Thames at Bourne End, on the reach above Cookham Lock. High Wycombe takes part of its name from the river, which now runs mostly underground through the town. Pann Mill watermill, at the eastern end of Wycombe, is the last remaining watermill on the River Wye. There is a long history of water-mills being operated in the Wye Valley which drops about 200 feet in its 9-mile course. The