Offa's Dyke

Offa's Dyke is a large earthwork along the border between England and Wales. The structure is named after Offa, the 8th-century king of Mercia who may have ordered its construction around the Early Middle Ages. The Dyke, which was up to 65 feet (20 m) wide and 8 feet (2.4 m) high, crossed low ground, hills and rivers. Some of its route is followed by the Offa's Dyke Path; a 176-mile (283 km) long-distance footpath that runs between Liverpool Bay in the north and the Severn Estuary in the south. Some of the best remains of the earthworks can be seen close to the information centre at Knighton.