A 100 km mountain ultramarathon in Eryri (Snowdonia) featuring high-level terrain including ridges, summits and technical trail. The course includes significant elevation gain through sustained climbs and steep descents across rugged mountain ground. Underfoot conditions vary between rocky path, scree and rough trail, with exposure on higher sections. Checkpoints and aid stations are positioned along the route according to organiser logistics.

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