An 80 km (50 mile) looped ultra in the Chiltern Hills starting and finishing at Goring-on-Thames. The route follows woodland trails, chalk escarpment paths and rural footpaths with around 1,700 m of ascent. Fully marked, with aid stations positioned around the course.

Other races at the same event weekend:
Chiltern Wonderland Trail Marathon , 42 km (26 miles)