Greenway · Asturias
Bear Trail by Bike
The most spectacular route in northern Spain on two wheels. 22 km of greenway through rock gorges, Atlantic forest and free-roaming brown bears.
The Bear Trail (Senda del Oso), a paradise for cycling enthusiasts, awaits you with breathtaking landscapes and an unforgettable experience. This complete guide provides all the information you need to plan and make the most of your adventure by bike. The route passes through the protected natural setting of the Trubia Valley, declared a UNESCO Biosphere Reserve.
Discover the secrets of this iconic route, from bike rentals to the most outstanding points of interest, and get ready for an unforgettable journey in the heart of Asturias.
100% traffic-free greenway for cyclists
Built on an old railway platform, there are no road crossings. The trail is shared with hikers, so it is recommended to ride on the right, slow down on bends and signal when overtaking. Ideal for children from 5–6 years old with their own bike or a trailer bike.
About the route
Introduction to the Bear Trail
Everything you need to know about the history, natural environment and importance of this unique greenway.
What is the Bear Trail?
The route is a greenway that follows old mining railway tracks, making it an ideal destination for cycling. Adapted for bikes, it offers a safe and accessible journey that lets you soak up the best of Asturian nature.
It is a perfect route for families, couples and groups of friends looking for an outdoor escape. Cycling the Bear Trail is undoubtedly one of the most beautiful greenways in the heart of Asturias.
The Bear and its environment
The name of the trail pays tribute to the brown bear, an emblematic species of the region. In Proaza you can visit the Bear House and the bear enclosure, where you can see Cantabrian brown bears near the trail in a controlled and respectful setting.
The presence of the bear highlights the importance of conserving native fauna and flora. FAPAS has been working for decades on the recovery of the Cantabrian brown bear, whose population has grown thanks to conservation projects like those surrounding this route.
History of the Bear Trail
The history of the Bear Trail dates back to its mining past, when it was used to transport coal. With the closure of the mines, the track was converted into a greenway adapted for cycling and hiking.
This transformation created a unique natural space where history and nature merge. The route is part of the Spanish Greenways Network and is managed by the Mancomunidad del Valle del Trubia.
Three route options
Bear Trail Cycling Routes
Choose the section that best fits your available time and the people joining you.
Short Route: Bear Enclosure 🐻
🟢 Very easyIdeal for families with young children or if you have limited time. A simple, mostly flat ride straight to the bear enclosure.
- Start: Tuñón
- End: Bear enclosure (Proaza)
- Distance: 5 km (one way) · 10 km round trip
- Type: Round trip
- Profile: 📈 Practically flat
- Duration: 30–45 min each way
💡 Tip: arrive before midday to see bears Paca and Molina at their most active.
Classic Route: Tuñón–Proaza 🚵
🔵 EasyThe most popular section of the Bear Trail. It combines illuminated tunnels, River Trubia gorges and the bear enclosure in one well-balanced ride.
- Start: Tuñón
- End: Proaza
- Distance: 11 km (one way) · 22 km round trip
- Type: Round trip
- Profile: 📉 Very gentle gradient
- Duration: 1.5–2 h each way
💡 Tip: many rental companies offer a pick-up service so you don't need to cycle back.
Long Route: Full Valley 🎒
🔴 ModerateThe complete journey through the Teverga Valley. Includes the most spectacular sections: Valdecerezales gorge, long tunnels and Valdemurio Reservoir at the end.
- Start: Entrago (Teverga) or Tuñón
- End: Tuñón / Proaza
- Distance: 25–30 km approx.
- Type: Linear (usually with transport back)
- Profile: 📉 Progressive descent (Entrago → Tuñón)
- Duration: 3–4 h
💡 Important: recommended in the downhill direction (Entrago → Tuñón) to make the most of the gradient.
Before you set off
How to Prepare for the Bear Trail by Bike
How to do the Bear Trail
To do the Bear Trail in the best way, first consider the type of experience you are looking for. Do you prefer a relaxed ride enjoying the scenery, or a more sporty ride? If you choose the first option, you can start in Tuñón and pedal to Entrago, enjoying a gentle descent. If you want more of a challenge, start in Entrago and ride in the opposite direction, tackling a gradual climb. Choosing the right starting point is key to making the most of the Bear Trail by bike. The route is suitable for all ages and abilities, but good planning is essential.
Planning your bike route
Planning your cycling route on the Bear Trail involves several factors. The trail is long, so assess your fitness and that of your companions. You can choose to ride just one section. Decide which points of interest you want to visit, such as Valdemurio Reservoir or the bear enclosure in Proaza. To make things easier, you will find services such as:
- Bike rentals along the Bear Trail.
- On-route assistance.
It is also advisable to book in advance, especially in peak season.
Best time to visit
The best time to visit the Bear Trail by bike is spring and autumn. In these seasons the weather is milder and more pleasant for cycling, avoiding the intense summer heat and frequent winter rain. In spring, nature is at its most vibrant, with colourful landscapes. In autumn, the forests turn shades of red and gold, creating a magical atmosphere. However, the Bear Trail is an attractive destination all year round as long as you take the necessary precautions. Always check the weather forecast and wear appropriate clothing.
Ready to ride
Book your bicycle in advance
In peak season bikes sell out fast. Secure yours with the pick-up service included and start pedalling without a worry.
Bike rental
Bike Rental Options
Local bike rental
If you don't have your own bike, don't worry — renting is a very popular option on the Bear Trail. Along the route, especially at strategic points, you will find several rental companies. They typically offer:
- A wide range of bicycles, from basic models for a relaxed ride to more sophisticated mountain bikes.
- Helmets and, in many cases, on-route assistance.
It is advisable to book in advance, especially in peak season, to make sure you get the bike you need.
Choosing the right bike for the route
Renting the right bicycle is crucial to enjoying the Bear Trail. Consider the type of ride you plan — if you are sticking to the main greenway, a city or hybrid bike will be fine. If you plan to explore nearby tracks or do a more technical descent, a mountain bike with suspension may be more appropriate. Rental companies usually offer advice to help you choose the ideal bike for your level and plans. Make sure the bike is in good condition, with working brakes and properly inflated tyres.
Tips for choosing the best bike
To choose the best bike for the Bear Trail, keep these key points in mind:
- Assess the trail length and prioritise comfort, especially if you plan to ride the full route.
- Consider the terrain and choose a bike suited to the greenway, which is mostly flat with occasional gentle slopes.
Also think about your experience level and on-route assistance options. Don't hesitate to try different models before deciding — renting the right bike will make your Bear Trail experience much more enjoyable and safe.
Route map
Cycling the Bear Trail
The Bear Trail is a unique experience in the heart of Asturias, ideal for nature and cycling lovers. Following the old mining railway track, the greenway offers a safe route suitable for all ages, making it a perfect choice for families. The length of the trail lets you choose different sections, adapting the ride to your level and preferences.
Inicio del Descenso - Alquiler de Bicis en Entrago
Comienza aquí tu aventura en descenso. Alquiler de bicicletas de última generación, cascos desinfectados y servicio de transfer incluido. ¡Reserva tu plaza!
Ver más informaciónEmbalse de Valdemurio - Vistas Espectaculares
Un oasis de paz. Ideal para una parada fotográfica, picnic o para recorrer su puente de madera. Una vista imprescindible si eliges la variante de Quirós.
Ver más informaciónCercado de las Osas Paca y Molina
Punto culminante de la ruta. Visita el cercado de las osas pardo cantábrico. La mejor hora para verlas es a las 12:00h durante la comida.
Ver más informaciónFinal de Ruta y Punto de Recogida
¡Logro completado! Recupérate en el Área Recreativa de Buyera. Aquí te recogerá nuestro servicio de transfer gratuito para volver al inicio. Llama 1 hora antes.
Ver más informaciónHaz clic en los iconos del mapa para ver los puntos clave de la ruta.
Cycling the descent: tips and recommendations
If you decide to descend by bike from Entrago, get ready for a smooth and enjoyable ride. Before setting off, check your brakes and make sure you have water and a snack. The descent is relatively easy, but it is important to stay alert and respect the greenway rules. Plan stops to rest and take in the scenery. Cycling the descent is an excellent way to enjoy the Bear Trail by bike.
Points of interest near the trail
While riding the Bear Trail, don't miss the many points of interest nearby. In Proaza, visit the Bear House and the bear enclosure to learn more about the brown bear. Valdemurio Reservoir offers a spectacular landscape, ideal for a photo stop. Along the route you will also find rest areas, information panels and charming villages. Make the most of your getaway and discover all the trail's secrets.
Beyond the route
What to See Near the Bear Trail
Combine your cycling day with these must-sees of the Trubia Valley. Make the most of your visit and discover all its secrets.
Bear Enclosure in Proaza
Bears Paca and Molina live in a semi-wild enclosure right next to the trail. The best time to see them active is at 12:00, when they are fed. Seeing a Cantabrian brown bear up close is one of the great highlights of the route.
Valdemurio Reservoir
A spectacular reservoir tucked between mountains at the end of the Teverga branch. The contrast between the green forests and the intense blue of the water makes it a must-stop for photos. A landscape that on its own justifies extending the ride.
Bear House in Proaza
Interpretation centre dedicated to the Cantabrian brown bear: its history, behaviour and the conservation work carried out in the Cantabrian Mountains. Essential if you are travelling with children or want to understand the ecological importance of the area before setting off.
Get the most out of it
Tips for Cycling the Bear Trail
Once you've ridden it, recommending it is easy. Here are the final tips to make your experience perfect from start to finish.
Recommend the trail to others
Recommending the trail to others is easy after experiencing it. Cycling the Bear Trail is an unforgettable experience worth sharing. Encourage them to plan their visit, book bike rentals in advance and choose the section that best suits their preferences.
Highlight the beauty of the Asturian landscape and the chance to see the bears near the trail in Proaza. Share your photos and experiences on social media to inspire others to discover this gem.
Your own bike vs. rental
The decision between using your own bike or renting one depends on several factors. If you have a suitable bike for greenways and feel comfortable on it, bringing your own could be a good option. However, renting locally has its advantages: you avoid transporting the bike, you have access to a wide range of bicycles and you can count on on-route assistance.
Moreover, if you are unsure which type of bike is best for the Bear Trail, renting lets you try different models before committing.
Conclusions on the cycling experience
In conclusion, the cycling experience on the Bear Trail is an unforgettable adventure combining nature, sport and culture in the heart of Asturias. Renting the right bike, planning the route and enjoying the scenery are the keys to a successful trip.
Whether you choose to ride the full route or just a section, this greenway will surprise you with its beauty and charm. Don't hesitate to add cycling the Bear Trail to your list of must-do destinations.
What those who have already ridden the route say
"An incredible experience. We rented electric bikes and it was the perfect decision. The route is beautiful and very well signposted. We are coming back next year."
"We did the full route as a family with children aged 8 and 10. The terrain is very comfortable and they loved the tunnels. Seeing the bears was the highlight of the trip."
Common Questions
Frequently Asked Questions
We solve the most common doubts so that your getaway to the Bear Trail is perfect.
How many kilometers long is the Bear Trail?
The Bear Trail is approximately 50 km in its full route, divided into several sections that you can do independently.
Is it suitable for families with children?
Yes, it is one of the most suitable routes for families in Asturias. The terrain is flat and well-signposted. We recommend the Tuñón–Proaza section for the little ones.
Can it be done with a dog?
Yes, dogs are welcome as long as they are on a leash. There are water fountains at several points along the route.
How long does it take to complete the full trail?
For the full route, you will need between 5 and 7 hours walking at a leisurely pace. Most visitors divide the route into two days.
Ready to ride
Book your bicycle now!
Secure your Bear Trail adventure with the best equipment and on-route assistance service. Don't miss out!