Offa's Dyke Path runs along the border between England and Wales. This National Trail opened in 1971, and follows the remnants of Offa's Dyke, constructed in the 8th century. It crosses a variety of landscapes, including the Black Mountains and Shropshire Hills. Overall, this trail is considered to be of moderate difficulty. Terrain is generally mild, though there are some more challenging sections in the uplands and switchback areas. However, the weather is usually mild, and the closeness to civilization helps to ease logistical concerns.