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National Park los Collados del Asón

Top 2 Mountain Passes around National Park los Collados del Asón

Best mountain passes around National Park los Collados del Asón are located in the Cantabrian Mountains, Spain, featuring diverse landscapes. The park is characterized by mountainous terrain, deep river valleys, and dense forests, shaped by karstic processes and glacial action. These passes provide access to unique natural features, including limestone outcrops, beech forests, and views of the glacial landscape. The area offers various trails for exploring its distinct natural environment.

Best mountain passes around National Park los Collados del Asón

Last updated: July 10, 2026

La Sía Pass

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very windy, wrap up well

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Alto de la Posadía

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From the Alto de la Posadía we can see the Poljé de Brenavinto perfectly and thanks to the informative signs we can go to various routes, along various paths that leave or unify from here.

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This is one of the most beautiful climbs in the region. It's 17.5 kilometers long, accumulating almost a thousand meters of elevation gain at an average of 5.7%.
Spectacular scenery, little traffic, and a fairly easy gradient distribution.

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Viewpoint of Portillo de la Sía

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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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Popular around National Park los Collados del Asón

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Robert Winner
August 28, 2025, Subida al puerto de Portillo de Lunada desde San Roque de Riomiera

Climb with spectacular views

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This is one of the most beautiful climbs in the region. It's 17.5 kilometers long, accumulating almost a thousand meters of elevation gain at an average of 5.7%. Spectacular scenery, little traffic, and a fairly easy gradient distribution.

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nabartu
September 8, 2024, Portillo de La Sía

very windy, wrap up well

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Nice path through lush meadows. Only animals, no people.

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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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Mythical place on the routes of the Collados del Asón Natural Park

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Perhaps one of the most descriptive sites of which is the landscape of the Asón hills. Here, in addition, several paths converge that allow you to cover it almost completely, although when hiking, they can be very technical or even impassable for the bike.

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A good place for a break on the way, after the slope from the cols. very good views

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Frequently Asked Questions

What are the most notable mountain passes to visit in National Park los Collados del Asón?

The region offers several significant mountain passes. Portillo Lunada is known as a starting point for the challenging path to Castro Valnera and is the third highest pass in Cantabria. La Sía Pass serves as a gateway to Peña Lusa, offering high mountain and open landscapes. Additionally, Asón Pass (Collados del Asón) is notable for being near the source of the Asón River and its impressive waterfall.

Are there any circular hiking routes around the mountain passes?

Yes, there are circular routes available. For instance, a 12.8 km circular route starts from the top of Asón Pass (Collados del Asón), leading through beech forests and to a summit overlooking the ancient Hondojón Glacier. You can find more hiking options in the area, including circular routes, by exploring the Hiking around National Park los Collados del Asón guide.

What natural features can I expect to see when visiting these mountain passes?

The mountain passes in National Park los Collados del Asón are characterized by diverse landscapes shaped by karstic processes and glacial action. You'll encounter dramatic limestone formations, deep river valleys, small beech forests, and unique Cantabrian holm oaks. The area around Asón Pass is particularly known for the 70-meter Asón River waterfall and views of glacial landforms.

What is the best time to visit the mountain passes in National Park los Collados del Asón?

The best time to visit depends on your activity. While many passes offer stunning views year-round, some, like Portillo Lunada, are frequently closed in winter due to heavy snow, sometimes for several months. For hiking and cycling, late spring through early autumn generally offers the most favorable weather conditions.

Are there any easy mountain passes suitable for beginners or families?

While many routes in the region can be challenging, some areas offer more accessible experiences. For instance, the Alto de la Posadía viewpoint, often reached after a climb, provides a good place for a break with excellent views of the Poljé de Brenavinto. For easier walks, consider exploring the Easy hikes around National Park los Collados del Asón guide.

What kind of hiking trails are available near the mountain passes?

Near the mountain passes, you'll find a range of hiking trails varying in difficulty. For example, from Portillo Lunada, you can access a challenging 9.5 km path to Castro Valnera. From Portillo de la Sía, an 11.8 km trail leads to Peña Lusa. For a comprehensive list of routes, check the Hiking around National Park los Collados del Asón guide.

What do visitors enjoy most about the mountain passes in this region?

Visitors frequently highlight the spectacular scenery and expansive mountain views. The climb to Portillo de Lunada from San Roque de Riomiera is particularly praised for its beauty and low traffic. Many appreciate the feeling of being in high mountain and open landscapes, as well as the impressive vistas from viewpoints like the Viewpoint of Portillo de la Sía.

Are there opportunities for other outdoor activities besides hiking near these passes?

Yes, beyond hiking, the region offers other outdoor activities. You can find various running trails around the National Park, suitable for different fitness levels. Explore options like the Asón Valley Trail or the Asón Waterfall loop by visiting the Running Trails around National Park los Collados del Asón guide.

What are the typical elevations and difficulties of the mountain passes and their associated trails?

Mountain passes in the region vary in elevation. Portillo Lunada is at 1,316 meters above sea level, and the trail from there to Castro Valnera involves significant elevation gain. The trail from Portillo de la Sía to Peña Lusa (1,574 meters) also navigates high mountain passes. Many trails are rated as moderate to difficult, offering rewarding experiences for experienced hikers.

Is parking available at the trailheads for these mountain passes?

Generally, parking is available near the starting points of popular trails and passes. For example, there are access points and parking areas for routes originating from Portillo Lunada and Portillo de la Sía. It's always advisable to check specific route details for precise parking information.

Are permits required for hiking or accessing the mountain passes?

National Park Los Collados del Asón is generally open for public access, and specific permits are typically not required for hiking on established trails or visiting the mountain passes. However, it's always good practice to respect local regulations and any signage you may encounter within the park.

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See even more epic mountain passes by checking out these guides around National Park los Collados del Asón:

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