Canyons around Caso, Asturias, Spain, are situated within a wild and mountainous area known for its dramatic landscapes. This region is part of the Redes Natural Park, a UNESCO Biosphere Reserve, featuring European beech forests and rugged terrain. The area offers numerous routes through narrow valleys and gorges carved by rivers. Visitors can explore these natural features while experiencing local culture, including wood handicrafts and Casín cheese.
Last updated: November 4, 2026
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And suddenly there is forest - at least, that's how it seemed to me when, after a steep ascent through a very narrow part of the gorge, I was no longer walking on a rocky path with a few rather small trees along the roadside, but on partly thick layers of leaves, comfortably walking a flatter section through beech forest - partly so dense that it became quite gloomy compared to before. Pleasant change after the rocky path beforehand.
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Coming from Caleao, the cart track ends here at the last house into the Desfiladero de los Arrudos and from here you continue on a largely natural path into the gorge, which digs itself ever deeper and steeper into the mountains. This gorge is truly impressive, the path is worth it.
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Following the natural course of the Sella River from its source in the Sajambre Valley, the Los Beyos Gorge is about 20 km long. For almost 400 years the existence of a farmer's path that crossed this wild gorge has been known.
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The Banner River is born in the Sierra de Peñamayor. Already in its upper course, at the Bridge of the Banner River, it receives the waters of the Bomalu stream.
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The Arrudos gorge is one of the great river canyons of Asturias and a very impressive and colorful route.
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The tunnel was carved by hand through which in the past the animals had to be unloaded so that they could pass through. Now, it is somewhat wider and allows tractors etc. to pass. Without a doubt, it is the most spectacular area of the route, with impressive vertical precipices.
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The Caso region offers several impressive natural features. The Arrudos Trail is renowned as one of Asturias' great river canyons, offering a very impressive and colorful route. You can also explore the Pendón River Gorges, known for their natural beauty and viewpoints, and the dramatic Los Beyos Gorge, which stretches for about 20 km along the Sella River.
The canyons in Caso feature rugged, mountainous landscapes with steep, rocky sides carved by rivers. You'll find a striking contrast of geological formations, including impressive vertical precipices, especially near the Crestón Tunnel. The region is also characterized by lush European beech forests, such as the Beech forest in the Arrudos Gorge, and numerous rivers like the Pendón River.
Most trails through the gorges in Caso, such as the Arrudos Trail and the paths around the Pendón River Gorges, are generally considered intermediate. While some sections can be easy and beautiful, others involve steeper ascents and rocky paths. The Crestón Tunnel area, for instance, is noted for its impressive vertical precipices, indicating a more challenging environment.
While many trails are intermediate, the Arrudos Trail is described as an "easy and beautiful route" in parts, making it suitable for families looking for a less strenuous experience. It's always advisable to check specific route details and conditions, especially with younger children, as some sections may still be rugged.
The region is generally open year-round, but the best time to visit for hiking and exploring the gorges is typically during spring, summer, and early autumn. These seasons offer more favorable weather conditions, making trails more accessible and enjoyable. Caution is advised after heavy rains due to potential flooding in riverbeds and slippery conditions on rocky paths.
Beyond exploring the gorges themselves, the Caso region offers a variety of outdoor activities. You can find numerous options for road cycling, including routes like the "Soto de Agues Village loop from Sobrescobio" or the challenging "Puerto de las Señales – Tarna Pass loop." There are also running trails, such as the "Pico les Llombes – Mirador de Llagos loop." For more details, you can explore the Traffic-free bike rides around Caso, Running Trails around Caso, and Road Cycling Routes around Caso guides.
The Caso municipality is part of the Redes Natural Park, a UNESCO Biosphere Reserve, highlighting its ecological and cultural importance. The area is known for its local culture, including traditional wood handicrafts and the famous Casín cheese. Historically, paths like the one through the Los Beyos Gorge have been known for centuries, and the Crestón Tunnel itself is a hand-carved historical feature, originally used for animal transport.
The municipality of Caso, being a rural area within a natural park, offers local amenities in its villages. While specific cafes or pubs directly at the gorge entrances might be limited, you can find local establishments in nearby towns and villages where you can experience Asturian hospitality and cuisine, including traditional dishes and local products like Casín cheese.
The Arrudos Defile, or Arrudos Trail, is a significant natural feature within the Redes Natural Park. It's celebrated for its dramatic landscapes, the impressive way the gorge digs itself deeper into the mountains, and the transition from rocky paths to dense European beech forests. It offers a truly immersive experience in the rugged beauty of the Asturian mountains.
Yes, several areas within the gorges offer excellent viewpoints. The Pendón River Gorges are specifically noted for their viewpoints. Additionally, the Crestón Tunnel area provides spectacular views of vertical precipices, offering a dramatic perspective of the surrounding landscape.
When exploring the gorges, it's recommended to wear appropriate hiking footwear, as paths can be rocky and uneven. Bring water, snacks, and layers of clothing suitable for changing mountain weather. A map or GPS device is also advisable, especially for longer routes. If visiting after rain, be prepared for potentially muddy or slippery conditions.
Absolutely. The Caso region, with its dramatic gorges, lush beech forests, and clear rivers, offers abundant opportunities for nature photography. The vibrant colors of the Arrudos Trail, the striking geological formations, and the serene beauty of the Beech forest in the Arrudos Gorge provide diverse and captivating subjects for photographers.


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