Offa's Dyke Path (Welsh: Llwybr Clawdd Offa) is a long-distance footpath following closely the Wales–England border. Opened in 1971, it is one of Britain's National Trails and draws walkers from throughout the world. Some of the 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. However, the dyke is not present on the Black Mountains, Wales and the path here follows the current Wales-England border along the Hatterall Ridge.