A 100 km ultramarathon based around Repton in Derbyshire, using a looped course through countryside on the edge of the Trent Valley. The route follows rural footpaths, bridleways, woodland trails and field tracks, with moderate elevation gained through rolling terrain rather than sustained climbs. Underfoot conditions vary between firm track and softer ground depending on weather. Participants complete multiple laps returning to a central base area, where aid and support are available. Navigation approach, course marking and aid station arrangements are defined by the organiser’s official race information.