A 161 km (100 mile) point-to-point ultramarathon from Goring-on-Thames to Henley-on-Thames following sections of the Thames Path and the Ridgeway, with approximately 1,500 m of ascent. The route combines riverside towpath, chalk trail and rural tracks across lowland terrain, with elevation gained gradually rather than through sustained climbs. Surfaces are predominantly firm and runnable, though chalk sections can become slippery in wet conditions. The course is fully marked with numerous aid stations positioned along the route in accordance with the organiser’s event structure.