High Force is a waterfall on the River Tees, near Middleton-in-Teesdale, Teesdale, County Durham (until 1974 part of Yorkshire), England. The waterfall is within the North Pennines Area of Outstanding Natural Beauty (AONB) and European Geopark. Despite popular belief, it is not, at 21.5 metres (70 ft), the highest waterfall in England: Cautley Spout, in Cumbria’s Howgill Fells, is almost 180 metres (600 ft) high and Hardraw Force, in North Yorkshire, has an unbroken drop of 30 metres (100 ft).