Best mountain passes around Tudanca, a village in Cantabria's Nansa Valley, offer access to significant mountain terrain. The region is characterized by its natural beauty, historical elements, and opportunities for outdoor activities. Notable passes include Puertos de Sejos and Puerto de Palombera, both within the Saja-Besaya Natural Park. These areas provide diverse landscapes, rich biodiversity, and archaeological sites.
Last updated: July 1, 2026
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From Los Tojos (636 m) and Colsa (729 m) the rope is gained at the Venta Vieja pass (1152 m), where one of the many inns that awaited the traveller along the way was located.
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A hill located below the summit of the same name as the Saja reserve, resting on a ridge of gentle elevations above the Cabuérniga valley. These Saja mountains are often known as the Sierra de Bárcena Mayor, due to the town that lies at its feet at an altitude of 534 metres. In ancient times, the so-called Camino de Castilla or Reinosa road crossed this ridge towards the lands of Campoo. From Los Tojos (636 m) and Colsa (729 m) the ridge was reached at the Venta Vieja hill (1152 m), where one of the many inns that awaited the traveller along the way was located.
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The Collada de Carmona is a mountain pass in the Cantabrian mountain range located in western Cantabria.[1] It rises to 601 m above sea level and links the towns of Valle to the east and Carmona to the west, both belonging to the municipality of Cabuérniga.
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The Monte Aa Pass is a very beautiful climb with spectacular landscapes. The pass is located on the mountain that separates Carmona from Ruente. Along the route we will find different trees catalogued within the Inventory of Singular Trees of Cantabria. These are spectacular specimens of oak and beech. The Monte Aa forest is made up of a mature oak forest dominated by oaks. To a lesser extent, there are beeches, sessile oaks and oaks. The abundance of holly trees is remarkable. As for the fauna that inhabits it, birds such as the goshawk, the sparrowhawk, the black kite, the common buzzard, the common kestrel, the woodpecker and other forest birds stand out. Mammals such as the roe deer, the deer or the badger and carnivores such as the marten or the polecat.
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The Abellán pass (also called the Joza de Abellón pass) is reached by a steep track. From this point, the views of the Peña Sagra mountain range, with the Cornón standing out from the rest of the peaks, are impressive.
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It has a length of almost 6 km, an altitude of 554 meters and an average slope of 5.62%.
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Great paths for biking and the views are spectacular! Almost free of traffic and in perfect condition. Watch out for cows and cow pats on the road!
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You can climb from Puentenansa, or from Puente Arrudo through the gorge to Quintanilla or also from La Hermida after climbing the Collado Hoz.
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The region around Tudanca offers several passes with stunning views. The Collada de Carmona is known for its spectacular vistas and great paths for biking. Another excellent option is Collado Abellán, which provides impressive views of the Peña Sagra mountain range, with the Cornón peak standing out. For a high-altitude experience, Puerto de Palombera offers panoramic views of the Campoo and Cabuérniga Valleys.
Yes, several passes are popular with cyclists. The Collada de Carmona features excellent, low-traffic paths. The Collado de Ozalba is another notable climb, almost 6 km long with an average slope of 5.62%. Additionally, Puerto de Palombera is renowned for its winding, paved road (CA-280), making it a thrilling route for road cyclists.
The mountain passes around Tudanca are rich in natural beauty. At Collado de Monte Aa, you'll find a mature oak forest with beeches and sessile oaks, and an abundance of holly trees. The area is home to diverse fauna, including goshawks, roe deer, and badgers. The Puertos de Sejos, accessible from Puerto de Palombera, offers wild landscapes with crystal-clear waters, diverse wildlife like golden eagles, bears, and deer, and is the source of the Bijoz and Infierno streams.
Yes, the region has significant historical and archaeological value. The Puertos de Sejos, for instance, is part of the Collado de Sejos-Cuquillo Megalithic Station, a Site of Cultural Interest. It features ancient stone structures like menhirs, some dating back to 1500 BC, and large glacial remnants known as 'Los Cantos de la Borrica.' The Alto del Tambuey also lies on what was once the Camino de Castilla or Reinosa road, an ancient route.
Beyond exploring the passes themselves, the area around Tudanca offers a variety of outdoor activities. You can find numerous hiking trails, including challenging routes like the Lamiña Waterfalls loop or the Monte Aá Trail, as well as easier options. For mountain biking, there are routes such as the San Sebastián de Garabandal circular or the Los Tojos – Correpoco Trail. Traffic-free bike rides are also available, like the Ucieda Mountain House loops. You can explore more options on the dedicated guides for Hiking around Tudanca, MTB Trails around Tudanca, and Traffic-free bike rides around Tudanca.
Puerto de Palombera is generally open year-round, with only short closures during winter. For hiking and cycling, late spring, summer, and early autumn typically offer the most favorable weather conditions, allowing for full enjoyment of the trails and scenic drives. Always check local weather forecasts before your visit, especially for higher elevations.
While many passes involve significant climbs or trails, the surrounding areas offer options for families. The natural parks and forests, such as those around Collado de Monte Aa, provide opportunities for gentle walks and wildlife spotting. When planning a visit with family, consider the easier hiking routes available in the region, which can be found in the Hiking around Tudanca guide.
The Puertos de Sejos is a unique high-mountain area within the Saja-Besaya Natural Park, known for its wild beauty, profound silence, and rich biodiversity. It's a place where you can encounter golden eagles, bears, wolves, and deer. Beyond its natural appeal, it holds significant archaeological value with ancient menhirs and glacial remnants, and ethnographic importance with traditional shepherds' huts still in use. It offers a deep immersion into nature, history, and traditional pastoral life.
Puerto de Palombera is highly accessible by road, featuring the well-maintained CA-280. It reaches an elevation of 1,260 meters (4,133 feet) and is generally open year-round, with only brief closures during heavy winter snowfall. It serves as an important access point to other areas, including the high plains of Puertos de Sejos via a track near the old Tajahierro inn ruins.
The mountain passes and surrounding natural parks are home to diverse wildlife. In areas like Collado de Monte Aa, you might spot birds such as goshawks, sparrowhawks, and woodpeckers, along with mammals like roe deer, deer, badgers, martens, and polecats. The Puertos de Sejos is particularly rich, with majestic golden eagles, vultures, bears, wolves, deer, roe deer, wild boar, owls, wildcats, and badgers inhabiting the region.
When visiting the Collada de Carmona, be prepared for spectacular views and excellent paths, especially if you're biking. The road is almost free of traffic and in perfect condition. However, it's important to watch out for cows and cow pats on the road, as it's an active pastoral area.
The passes vary in elevation and difficulty. Collada de Carmona rises to 601 meters. Collado de Ozalba has an altitude of 554 meters with an average slope of 5.62% over nearly 6 km, making it an intermediate climb. Puerto de Palombera is a high mountain pass reaching 1,260 meters (4,133 feet), with its road featuring a maximum gradient of 8.7%. Many of the trails associated with these passes are rated intermediate to difficult.


See even more epic mountain passes by checking out these guides around Tudanca: