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
Wales vessels lost and an average loss of life of about 78 sailors per year. Wartime action caused losses near Holyhead, Milford Haven and Swansea. Because of offshore rocks and unlit islands, Anglesey and Pembrokeshire are still notorious for shipwrecks, most notably the "Sea Empress" oil spill in 1996. The first border between Wales and England was zonal, apart from around the River Wye, which was the first accepted boundary. Offa's Dyke was supposed to form an early distinct line but this was thwarted by Gruffudd ap Llewellyn, who reclaimed swathes of land beyond the dyke. The Act of Union of