Offa’s Dyke Path is a 177 mile (285 Km) long trail named after and often following the spectacular Dyke King Offa ordered to be constructed in the 8th century, probably to divide his Kingdom of Mercia from rival kingdoms in what is now Wales.
The trail, which was opened in the summer of 1971, links Sedbury Cliffs near Chepstow on the banks of the Severn estuary with the coastal town of Prestatyn on the shores of the Irish sea. It passes through eight different counties and crosses the border between England and Wales over 20 times. It explores the tranquil Marches (as the border region is known) and passes through the Brecon Beacons National Park on the spectacular Hatterrall Ridge. It also links three Areas of Outstanding Natural Beauty – the Wye Valley, the Shropshire Hills and the Clwydian Range / Dee Valley.
The official National Trail website for the path can be found here.