Ereta de Bies-San Úrbez-La Ripareta

  • Distance :3 km
  • Starting Point :Ereta de Bies car park.
  • Total climb/descent :50 m
  • Route type :Circular.
  • Time :45 minutes in total.
  • Difficulty :Easy.



The waters of the Bellos River and the Aso, its tributary, converge at the foot of the rural Shrine of San Úrbez in one of the most beautiful spots in the National Park. Cross the canyon by the impressive San Úrbez Bridge, discover the remains of an old mill and admire the waterfall over the Aso River.

The route begins at the Ereta de Bies car park. The path that starts here runs parallel to the road and leads to San Úrbez Bridge, the first of the bridges over the narrow defile of the Bellos River. The old bridge with its single stone arch, suspended more than 40 m up over the void, is a marvel to behold. Thousands of pilgrims have crossed it over the centuries, making their way to the Shrine of San Úrbez, which you come to a little further on. The simplicity of the construction of the shrine does not detract from its impressiveness but quite the opposite, as the old wall seems to form part of the rock on which it was built.

Continuing on your way, you come to a spring on your right and a path to the left, which you must take to descend to the floor of the canyon. Cross the bridge over the Bellos River. An information board here tells of the French Pyrenean explorer and climber Lucien Briet, who contemplated, described and photographed these self-same landscapes in the early 20th century.

The path begins to climb gently amid Scots pine and gall oak forests till it comes out to a small vantage point overlooking the Shrine of San Úrbez. You come to another vantage point a little further on, this one facing the Aso Gully and the remains of an old flourmill lost amid thick vegetation. The residents of Sercué and Nerín used to come to this mill to grind the wheat that they had harvested from their small plots of cropland.

The itinerary continues up the gulley till you come to a long metal walkway over the Aso River, with breath-taking views of the waterfall. From here, the path gently climbs up a paved track that takes you back to your starting point at Ereta de Bies.


Comply with notices on signs and the measures put in place to ensure your safety at the vantage points. You can follow this route at any time of year, but you must be very careful in winter due to the presence of sheets of ice.