The Greenwich Meridian Trail is a new long-distance walk from Peacehaven in East Sussex to Sand le Mere in East Yorkshire, following the line of the Prime Meridian. The total length of the trail is 273 miles (439 km). It is divided into four parts, this guidebook covers the third part which starts in the northern fringe of Cambridgeshire hills, traverses the flat lands of The Fens to finish in Boston, a town with far too much history. The guide uses ordnance survey maps for easy route finding and is full of information about the places you will visit and stay at along the way. Good access by public transport makes it easy to do the walk in sections.