The Ridgeway follows one of the oldest 'green roads' in Europe. It runs for 87 miles (140 km) from Overton Hill in the west, across the Marlborough Downs & the Vale of the White Horse, to Ivinghoe Beacon on the northern edge of the Chilterns, this is the complete, official guide for the long-distance walker or the weekend stroller. All you need is this one book. National Trail Guides are the official guidebooks to the fifteen National Trails in England & Wales & are published in association with Natural Engl&, the official body charged with developing & maintaining the Trails.