Valdemurrio Reservoir – Tunnel loop from Casares

Bike touring routes & trails

Valdemurrio Reservoir – Tunnel loop from Casares

Hard

4.5

(6)

riders

Valdemurrio Reservoir – Tunnel loop from Casares

04:52

51.1km

1,500m

Cycling

Hard bike ride. Very good fitness required. Mostly paved surfaces. Suitable for all skill levels.

Last updated: August 23, 2026

Tips

Your route passes through protected areas

Please check local regulations for:

Parque Natural de Las Ubiñas-La Mesa

Waypoints

Start point

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13.2 km

Valdemurrio Reservoir

Highlight • Lake

Picturesque reservoir in the valley of the Río Quirós.

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18.1 km

Desfiladero de Peñas Juntas on the Senda del Oso

Highlight • Gorge

Following the route of the old mining train, we arrive at this spectacular passage along the Senda del Oso.
Moderate your speed: remember that we share the road with pedestrians.

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18.3 km

Illuminated Tunnels of the Senda del Oso

Highlight • Trail

The illuminated tunnels of the path of the bear, one of the most fabulous points

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21.2 km

Natural Rock Tunnels on the Senda del Oso

Highlight • Natural

24.0 km

Rock Tunnels Along the Pathway

Highlight • Structure

26.1 km

Tunnel in Las Ubiñas-La Mesa Natural Park

Highlight • Structure

38.4 km

Embalse de Valdemurio

Lake

51.1 km

End point

Way Types & Surfaces

Way Types

21.6 km

19.0 km

8.71 km

1.68 km

191 m

Surfaces

20.4 km

18.5 km

9.79 km

2.43 km

< 100 m

Elevation

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Weather

Saturday 17 October

15°C

8°C

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Comments

June 14, 2025,Asturies: Draht-Esel-Tour auf dem Bärenpfad

The "Senda del Oso," the Bear Trail, leads south of Proaza in the Trubia Valley through deep gorges and tunnels, along a disused 150-year-old industrial railway line. Although it is supposedly the area with the highest bear density in Spain (or rather, was), you won't see any bears at the Bear House in Proaza or anywhere along the trail (thanks …

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