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La Sía Pass – Collado de Asón loop from Arredondo

Routes

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: May 29, 2026

Tips

Your route passes through protected areas

Please check local regulations for:

Parque Natural de los Collados del Asón

Waypoints

Start point

Parking

Get Directions

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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Tip by

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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41.6 km

End point

Parking

Way Types & Surfaces

Way Types

41.1 km

341 m

176 m

Surfaces

41.2 km

215 m

108 m

< 100 m

Elevation

Nothing selected – click and drag below to see the stats for a specific part of the route.

Highest point (1,220 m)

Lowest point (160 m)

Weather

Thursday 28 May

24°C

16°C

0 %

Additional weather tips

Max wind speed: 10.0 km/h

to get more detailed weather forecasts along your route

Our route recommendations are based on thousands of hikes, rides, and runs completed by other people on komoot.

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La Sía Pass – Collado de Asón loop from Arredondo

Cubera Cave

View of the Asón Waterfall from Mirador del Nacimiento del Asón

Viewpoint of the Asón Waterfall

Collados del Asón Natural Park Parking Area

Viewpoint of Portillo de la Sía

La Sía Pass

Panoramic View of the Cantabrian Side of Portillo de la Sía

Collado de Asón

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