A 50 km ultramarathon in West Yorkshire linking several reservoirs across the South Pennines. The route follows moorland trails, bridleways and reservoir-side paths with sustained climbs onto exposed high ground and long descents into valleys. Terrain is typical Pennine upland, with mixed surfaces including stone track, grass paths and rough moorland sections that can be soft in wet weather. Course marking, navigation approach and aid station provision are defined by the organiser’s official race information.