Difficulty: Easy. Time: 1 hour round trip (Total distance: 1.5km).
Leaving the car park at Ereta de Biés , you drop down to the road and detour towards the bridge of San Urbez , suspended 30 meters above the river Bellós .Nearby is the hermitage dedicated to San Urbez .
Leaving the main road, on the left, a path descends to the Bellós river bridge. . You gain altitude and passing various viewpoints reach the river Aso and it’s beautiful waterfalls. After going back up a short slope, on the left a detour in disrepair allows you to visit the ruins of the old mill.
Finally, exit to the main road and continue on to the car park.