A 161 km (100 mile) looped ultra starting and finishing at Goring-on-Thames using sections of the Thames Path and Ridgeway National Trail. The course follows riverside paths, chalk trails and rural tracks with approximately 1,500 m of ascent. Fully marked, with numerous aid stations throughout.

Other races at the same event weekend:
Autumn 100 , 161 km (100 miles)
Autumn 100 km , 100 km (62 miles)