North through Broxboune NNR and back on the Lea Navigation.
26 miles. En route stations: Hertford N and E, Broxbourne, Cheshunt; and places: Hertford & Ware town centres, New River Source, Amwell NNR, Lea Valley Park, Waltham Abbey. Two routes and GPX passes:
Crew’s Hill Spoke 1N. NB not all trains stop at Crew's Hill. From the next station Cuffley you can ride east to resume the spoke at Goff's Oak - or turn W then N and navigate the equally pleasant alternative Spoke 1N var via Bayford, reaching Arc 12 merged Cole Green Way a mile W of Hertford
Hertford Arc 1, which is soon on the towpath of the Lee Navigation for a delightful ride to Dobb's Weir. Indeed it's possible to continue on the towpath throughout, but taking NCN1 routing diverts through Lea Valley Park wetland bird reserves - and before that up a zigzag path to a hill viewpoint.
Enfield Lock - where you can take the train (1 mile west) - or return to your start point via Spoke 1E - an additional 5 miles.