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
St Mary’s Church, Hay-on-Wye St Mary’s Church, Hay-on-Wye St Mary's (also St Mary the Virgin) is an Anglican parish church in Hay-on-Wye, Brecknockshire, Powys, Wales. Separated by a deep dingle, which probably was formerly a moat, it is situated westward of the town upon an almost precipitous eminence, near to the River Wye. An earlier church, dedicated to St. John, called Eglwys Ifan, appears from the "Notitia Cambro-Britannica", to have been in good repair in 1684, and then used as a school-house. This building partly fell down about the year 1700, and was never repaired, though part of it was later used as a