A 95 km (59 mile) mountain ultramarathon in the Cheviot Hills on the England–Scotland border, with approximately 3,926 m of ascent. The route traverses remote upland terrain including high ridges, open moorland and rough ground, often away from maintained paths. Elevation is gained through sustained climbs onto exposed summits followed by long descents into valleys. Underfoot conditions include grass, peat, bog and rocky sections depending on location and weather. Navigation requirements, checkpoints and support arrangements are defined by the organiser’s official race guidance.