This is the trail run variant of the classic ski tour around the Sella Massif.  The trail runs through the towns of Selva, Corvara, Arabba and close to Canazei allowing to start in any of these villages. Best of all, it's a Marathon distance !

From WTA:

This is a fantastic trip -- amble along a river before making a steep climb to breathtaking ridge walks and astounding views of the craggy Cascades.

Your route begins by crossing a bridge and descending along the White River. Be sure to refill water bottles here. Though you may not yet need the water, you will later in the hike.