This site gives some historical background for the town of Hay-on-Wye in Brecknockshire, Wales. “The town of Hay-on-Wye lies on three borders. The national boundary with England, and the county boundaries of Brecknockshire and Radnorshire run through the town. Typically of Hay, the county boundary is marked by the famous River Wye, while the national boundary is hidden away, marked by the Dulais Brook which trickles down the valley a hundred yards or so away from the remains of the old Town Wall. The third boundary is that with the Brecon Beacons National Park, in whose corner Hay sits…” A history of Hay-on-Wye.