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.
Last updated: July 10, 2026
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Popular around National Park los Collados del Asón
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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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.
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.
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.
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.
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.
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.
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.
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.
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.
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.
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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