High Quality Content by WIKIPEDIA articles! Offa`s Dyke Path (Welsh: Llwybr Clawdd Offa) is a long distance footpath along the Welsh-English border. Opened in 1971, it is one of Britain`s premier National Trails and draws walkers from throughout the world. Much of the 283 km (176 mi) long route either follows, or keeps close company with, the remnants of Offa`s Dyke, an 8th century earthwork, the majority of which was probably constructed on the orders of Mercian King Offa.