The Mercian Challenge is a 100 mile race from Chepstow to Montgomery, part of the longer 185 mile Offa's Dyke race
The event begins at the Southern end of the National Trail in Chepstow. Then heads North, through Monmouth, passing countless historic buildings and castles, before climbing to 703m on the Black Mountain, then descending to the Town of Books Hay-on-Wye. You journey on through Kington and Knighton (home of the Offa’s Dyke visitor centre). The Clun Hills will challenge you next, reaching the 100 mile point at Montgomery.