A 100 mile mountain ultramarathon across Bannau Brycheiniog and surrounding Welsh uplands with approximately 5,000 m of ascent. The route links sections of established long-distance trails including Offa’s Dyke Path, the Cambrian Way and Beacons Way, traversing ridgelines, open moorland and remote mountain terrain. Climbs are sustained and cumulative, with extended exposed sections on higher ground. Underfoot conditions range from rocky trail to grassy path and rough upland ground. Navigation requirements, marking approach and aid station locations are defined in the organiser’s official event documentation.