A 51 km mountain ultra in the Brecon Beacons National Park starting and finishing near Llangattock with approximately 2,500 m of ascent. The route climbs onto the Black Mountains and surrounding high ground, using a mix of mountain paths, ridgelines and open upland terrain. Sections of the course traverse exposed ground with steep ascents and descents between valleys and summits. Navigation follows the event route with checkpoints and aid stations positioned at key locations. Held in spring, the race explores the eastern side of the national park above the Usk Valley.