The North Downs Way is an ancient trackway running along the ridge of the North Downs, stretching from Surrey to Kent. Now established as a National Trail, it is believed to be part of the route by which pilgrims travelled to the tomb of Thomas a Becket in Canterbury (see also Pilgrims Way). In fact it is a much older path, forming a dry highway across the chalk uplands, dating from prehistoric times. Although pilgrims from London and the Surrey area may have well trodden this route, it is more likely that most of them would have taken the flatter, wider and more direct route of Watling Street. The route runs for 141 miles (226 km) from Farnham to Dover.