Starting in Trin Mulin, the route climbs steadily through forest and open terrain towards Flims, then continues into the high alpine zone below the Flimserstein, ascending all the way to the Fil de Cassons ridge — entirely on foot, without the use of any cable cars. The trail follows old mountain paths and sections of the historic Flims rockslide area, one of the largest known landslides in the Alps.

The Green River Trail winds 19.77 miles through industrial lands near the Duwamish Waterway in Tukwila to the broad Green River Valley. The trail provides excellent views and access to the Green River and surrounding river valley from Salmon Cove Park near Seattle’s south boundary to North Green River Park in south Kent near Auburn. It is one of the longest contiguous regional trails in the Puget Sound Region.