The definitive guide to the New England's longest new hiking trail system built in nearly a century. The Cohos Trail stretches from Crawford Notch below Mt. Washington in the White Mountain National Forest all the way to a two-acre fen on the Canadian border that is the headwaters of the Connecticut River. And the trail links with the 70-mile Sentiers Frontaliers trail system in Quebec to create the second international hiking pathway in the East.