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 Dore River Dore The River Dore (Welsh: "Afon Aur" lit: 'the River of Gold') is a tributary of the River Monnow in Herefordshire, England. It rises on Cusop Hill, in the foothills of the Black Mountains, close to the border between England and Wales. It flows for through the villages of Dorstone, Peterchurch, Vowchurch, Abbey Dore and Pontrilas, before reaching the Monnow near Llangua. The Monnow itself is a tributary which flows into the River Wye at Monmouth. The name Dore probably derives from the Welsh word "dŵr", meaning "water". The word was later interpreted by the Norman French as ""d'or"",