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The CW50 is a 50 mile single loop around the beautiful Chiltern countryside. Runners must reach the finish within 13 hours to be elgible for awards. There are further cut offs on route. The route is a circular starting and finishing in Goring, with visits to Tokers Green, Bix, Ibstone, Christmas Common before joining the Ridgeway for two separate 3 mile stretches around Swyncombe Farm and Nuffield/ Grims Ditch.