La Sía Pass – Collado de Asón loop from Arredondo

Bike touring routes & trails

La Sía Pass – Collado de Asón loop from Arredondo

Hard

riders

La Sía Pass – Collado de Asón loop from Arredondo

03:16

41.6km

1,170m

Cycling

Hard bike ride. Very good fitness required. Mostly paved surfaces. Suitable for all skill levels. The starting point of the route is right next to a parking lot.

Last updated: August 27, 2026

Tips

Your route passes through protected areas

Please check local regulations for:

Parque Natural de los Collados del Asón

Waypoints

Start point

Parking

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2.71 km

Cubera Cave

Highlight • Cave

The Cubera cave is located at kilometer 2.8 of the road that goes from Arredondo to La Sia and its mouth is at the same level as the road and …

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9.03 km

View of the Asón Waterfall from Mirador del Nacimiento del Asón

Highlight • Viewpoint

In each horseshoe of the road you will have a panoramic point towards the imposing waterfall of more than 70 meters that physically marks the source of the Asón river. …

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10.1 km

Viewpoint of the Asón Waterfall

Highlight • Viewpoint

It depends on the rainfall regime, it can be a spectacle, or a disappointment: but only the flow of the waterfall.

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11.3 km

Collados del Asón Natural Park Parking Area

Highlight • Parking

From here the main routes of the Collados del Asón Natural Park begin. This car park is usually full on weekends and you can also park on the other side of the road

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20.6 km

Viewpoint of Portillo de la Sía

Highlight • Viewpoint

Meters before reaching the Port or Portillo de la Sía, at 1,200 m. altitude, we find the Mirador, from where we have impressive views of the Soba Valley.

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20.7 km

La Sía Pass

Highlight • Mountain Pass

very windy, wrap up well

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22.0 km

Panoramic View of the Cantabrian Side of Portillo de la Sía

Highlight • Viewpoint

Impressive viewpoint ideal for resting before attacking the last two ramps of the port of El Portillo del La Sía. Grazing cows and mountains, you couldn't ask for more.

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29.1 km

The Collado de Asón is an 11km section with a drop of 530m and an average gradient of 4.81%. The asphalt is perfect, with wooden fences on the curves, horizontal marking on the margins, etc. The traffic is light.

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