A 100 mile mountain ultramarathon in Eryri traversing remote high ground including major summits and ridgelines. The route features substantial cumulative ascent, technical terrain and extended sections of exposed mountain trail. Surfaces range from rocky path to rough ground, with conditions heavily influenced by weather. Participants must meet strict kit and navigation requirements.

• Other races at the same event:
Ultra-Trail Snowdonia 100K
Ultra-Trail Snowdonia 50K