Mountain passes in Las Ubiñas-La Mesa Natural Park are located in a UNESCO Biosphere Reserve in southern Asturias, Spain. The park features a mountainous terrain, with the Peña Ubiña massif exceeding 2,400 meters in elevation. This region offers diverse landscapes and historical routes. It provides various opportunities for outdoor activities across its terrain.
Last updated: May 31, 2026
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Popular around Las Ubiñas-La Mesa
Upon reaching the summit, you don't arrive at a village or a tourist center, but rather at a kind of natural balcony overlooking the Lena mountain passes, which gives a strange feeling, as if you've stepped onto an empty stage. And on clear days, the wind is louder among the mountain passes than any car, because traffic is minimal.
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For decades, La Cubilla was practically a ghost town: a road built to connect mining valleys, used more by livestock farmers and scattered trucks than by travelers. This lack of traffic left a remarkably clean route, free of curves, absurd straights, and modern widenings: pure mountain design from another era. That's why many cyclists say it "looks more like an Alpine pass than a Cantabrian one," with those giant limestone walls silently accompanying you.
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A port that you can grab from any of its sides
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The La Cubilla mountain pass is located at an altitude of 1,683 meters, on the border between Asturias and León. Its rugged terrain and the beauty of its surroundings have earned it the title of stage finisher of the Vuelta a España, making it one of the most iconic climbs among cyclists.
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Puerto de Ventana is a mountain pass located in the Cantabrian Mountains, between the Principality of Asturias and the province of León. It lies at an altitude of 1,587 meters and connects the municipality of San Emiliano in León with the Asturian municipality of Teverga. From the pass, you can enjoy a breathtaking view of the San Emiliano Valley, known as Babia de Yuso.
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The Puerto de la Cubilla is a mountain pass on the border between the Principality of Asturias and the community of Castilla y León. By MTB you can get there from San Emiliano (ten kilometers and 500 meters of positive gradient) or from Caldas de Luna (17 kilometers and 730 meters of positive gradient). It is part of the TransCantábrica BTT route.
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Mountain pass that is almost 1,600 meters high and has spectacular views of the Volant mountains.
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16 Km with leading percentages at the beginning and harder at the end, with a looser terrain that makes it harder, stunning views of the Quirós and Teverga Valleys, the Sierra del Aramo, La Peña Sobia and the Gamoniteiru, with fairytale forests . . . .
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The region is home to several significant mountain passes. Among them, La Cubilla Pass is popular for mountain biking and offers varied landscapes. San Lorenzo Pass is known for its challenging routes and panoramic views, while Ventana Pass provides breathtaking views of the San Emiliano Valley and connects León with Asturias.
You'll encounter diverse and stunning natural features. The passes are situated within the Las Ubiñas-La Mesa Natural Park, a UNESCO Biosphere Reserve, characterized by mountainous terrain, including the Peña Ubiña massif. Expect picturesque scenery, views of the Somiedo Mountains, deep valleys, and lush Asturian landscapes, contrasting with more arid Leónese areas, especially visible from passes like Ventana.
Yes, the region boasts significant historical routes. The Camino Real de la Mesa (GR-101) is an ancient Roman road that traverses several mountain areas within the park. This 'Royal Road' was a crucial link between Asturias and the Castilian plateau for centuries, offering insights into local history, including old mines and traditional 'brañas' (seasonal pasture settlements).
While some passes like Ventana are often cleared of snow for year-round access, the period from May to October generally offers warmer weather and no snow, making it ideal for exploring. This timeframe ensures more comfortable conditions for cycling, hiking, and enjoying the panoramic views.
Difficulty levels vary. Passes like San Lorenzo Pass are known for their challenging routes, with steep inclines and average gradients exceeding 8%. La Cubilla Pass offers long ascents that are not overly hard but require endurance. The Asturian side of Ventana Pass is considered significantly harder for cyclists compared to the Leónese side.
While many passes offer challenging routes, the broader Las Ubiñas-La Mesa region provides options for families. For easier walks, you can explore routes like the Senda del Oso: Valdemurio Reservoir Loop, which is listed as an easy hike in the area. Always check specific route details for suitability for children or dogs.
The area around the mountain passes is excellent for various outdoor activities. You can find numerous running trails, including challenging ascents to Peñas Ubiñas. For cyclists, there are extensive cycling routes that incorporate passes like San Lorenzo, Ventana, and La Cubilla. Hiking is also very popular, with options ranging from easy loops to demanding multi-day treks like sections of the Camino Real de la Mesa.
Many of the mountain passes themselves serve as exceptional viewpoints. For instance, Ventana Pass offers a breathtaking view of the San Emiliano Valley. Additionally, a viewpoint approximately 700 meters before the summit of Ventana Pass provides an even more expansive vista of the valley and the Ubiña massif. San Lorenzo Pass also provides spectacular panoramas of the valley.
Yes, mountain biking is a popular activity. La Cubilla Pass is a popular destination for mountain biking and is part of the TransCantábrica BTT route. You can access it from San Emiliano or Caldas de Luna, offering significant positive gradients for a good challenge.
Ventana Pass, at 1,587 meters, connects León and Asturias. It's renowned for its picturesque scenery and views of the San Emiliano Valley. Cyclists will find the Asturian side from San Martín de Teverga significantly harder than the Torrebarrio side. The road is generally in good condition with little traffic, making it enjoyable. A viewpoint 700 meters before the summit offers an even broader vista.
San Lorenzo Pass is a spectacular and challenging route, particularly popular with cyclists and hikers. It offers panoramic views of the valley and is located within the Somiedo Natural Park, known for its diverse fauna. The ascent from La Riera features steep inclines, with parts reaching 14-15%, providing an 'alpine' aesthetic and a rewarding experience.
The Camino Real de la Mesa (GR-101) is an ancient Roman road, not a single pass, but a significant historical and scenic route traversing mountain areas within the park. It's a long-distance hiking route, typically taking around 17 hours to complete its 56 kilometers, but it's also suitable for mountain biking and horseback riding. It offers a journey through diverse Asturian landscapes, well-marked with milestones and Roman remnants.


See even more epic mountain passes by checking out these guides in Las Ubiñas-La Mesa: