From the Ridgeway the route descends through woodland to the source of the River Misbourne which it follows through Amersham to Denham where it joins the River Colne and ends on the towpath of the Grand Union Canal.

This pleasant 45k loop takes you from the valley floor up into luscious tall eucalypt forest and rainforest, then along the single-track Rim Walk, winding through Morton National Park with spectacular views over Yarrunga Creek Valley and of Fitzroy Falls. As you descend down from the rim and into the other side of the valley, on either side of the fire trail you'll see heathland, woodland, tall Brown Barrel Forest and tree ferns. There is a short stretch along the shoulder of a busy road before Fitzroy Falls. Most of the route is highly runnable fire trail, and easy as ultras go.

The Stour and Orwell Walk is a long distance footpath which serves as an extension west from Felixstowe to the Suffolk Coast Path and follows the coast and heaths along the estuaries of the Orwell and the Stour, going around the Shotley peninsula to Cattawade, providing links with the Essex Way (at Manningtree, across the river) and the Stour Valley Path (East Anglia) (at Cattawade).