Offa's Dyke is a great frontier earthwork built by Offa, King of Mercia from 757 to 796 A.D. It gives its name to a long distance footpath, one of Britain's National Trails, which runs from Sedbury, near Chepstow, to Prestatyn through the varied and little-frequented landscapes of the Welsh Marches.

For more information visit the Offa's Dyke Association website.