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The Clif Bar 10 Peaks events are designed to challenge even the toughest competitors, combining ultra distance running/ hiking with some of the UK's most rugged and mountainous terrain. Navigation plays a major part as there are no marked trails leaving competitors to plot the quickest, safest route between the 10 highest peaks. Courses vary from 48km to 89km with up to 5600m of ascent to be completed within 24 hours.