Engaña Tunnel and Yera Station Loop

This route is generally considered moderate, requiring good physical fitness and some prior cycling experience. Sections include steep ascents, and you might need to dismount and push your bike at times, especially on stony ground near the Aján River. It's not ideal for absolute beginners.

The terrain is varied, featuring approximately 14.2 km of unpaved tracks, 3.85 km of asphalt, and 2.75 km of paved tracks. You'll encounter steep climbs and narrow sections. The path alongside the Aján River can be stony and potentially slippery after rain.

You'll experience spectacular natural beauty and historical sites. Key highlights include the beautiful Aján River Waterfalls, the historic Engaña Tunnel (which you can explore for a few kilometers), and the atmospheric Yera ghost station. You'll also see old stone bridges, smaller tunnels, and remnants of workers' barracks.

The route starts and ends in Vega de Pas. While specific parking areas aren't detailed, you should be able to find parking within the village to begin your circular journey. It's always a good idea to arrive early, especially on busy days.

Yes, this trail is generally dog-friendly. However, given the varied terrain, including stony and potentially slippery sections, ensure your dog is fit for the ride. Always keep your dog under control, preferably on a leash, to respect wildlife and other trail users.

Spring and autumn are generally the best times to ride this trail, offering pleasant temperatures and lush scenery. Summer can be warm, and winter may bring colder, wetter conditions, making some sections more challenging due to mud or slippery stones.

Currently, there are no specific permits or entrance fees required to mountain bike this route in the Valles Pasiegos region. However, always respect local regulations and private property, and practice Leave No Trace principles.

The Engaña Tunnel has been impassable since 1999 due to an internal collapse about 2.8 kilometers from the entrance. However, you can still explore a few kilometers into the tunnel from the Cantabrian side (Vega de Pas) to witness its abandoned infrastructure.

Yes, this route incorporates sections of several other trails. Notably, it covers about 33% of the [CIMA CA05] Estacas de Trueba trail and 11% of the Ferrocarril Santander-Mediterráneo trail, among others like Túnel de El Majoral and Túnel de La Engaña.

Vega de Pas is a charming village and offers options for cafes, pubs, and accommodation. You'll find places to refuel and rest before or after your ride, providing a convenient base for exploring the area.

Given the moderate difficulty and varied terrain, it's essential to bring appropriate mountain biking gear, including a helmet, gloves, and suitable clothing. Carry enough water, snacks, a basic repair kit, and a headlamp if you plan to explore the Engaña Tunnel.