The Fen Rivers Way is a walk between Cambridge and Kings Lynn following the Rivers Cam and Great Ouse. The main route mainly follows the weestern banks of the rivers, although there is an eastern alternative available between north of Cambridge and Ely. The route is mostly flat, with very little ascent or descent.

It is best to walk the trail from south to north, mainly because for the last 5 miles into Ely you get to see Ely cathedral rising above the Fens like a ship ahead of you, the towers seeming like masts. It also follows the river downstream, which always seems like a natural way of following a river.