Tuñón – Proaza
9,5 km 2h 30min EASY
Asturias · Natural Trail
Active route · Open all yearThe Bear Trail in Asturias (Senda del Oso)
A 50km greenway between ancient forests, gorges, historic tunnels and the home of the Cantabrian brown bears. Ideal for the whole family.
50 km Greenway
30+ Tunnels
Low Difficulty
Family Accessibility
The Route
What is the Senda del Oso?
An exceptional 50km greenway that combines industrial history, overflowing nature and family adventure. It was built over the tracks of an old mining railway that transported coal from the mines of Teverga and Quirós to the industry in Trubia.
Built at the end of the 19th century, this train operated until 1963. Today, its wonderfully recovered route invites you into the Cantabrian mountains with almost no elevation gain, crossing amazing gorges, dense forests and more than 30 tunnels carved into the rock.
Explore its main routes: the bear section (Tuñón–Proaza), the family route to Buyera or the spectacular Teverga branch.
Mores about the route
Spectacular Landscapes
Historic Tunnels
Authentic Villages
50 km Total length
30+ Stone tunnels
Low Difficulty
Family Accessibility
What to See on the Bear Trail
Discover the unique sights that make this route special
Top Sight Proaza Bear Enclosure
Home to the famous bear Molina. A unique space to observe the Cantabrian brown bear in semi-freedom. Managed by the Asturias Bear Foundation.
Spectacular Gorges
The Peñas Juntas and Valdecerezales gorges offer dizzying landscapes carved by the Trubia River.
🏔️ Landscapes 📸 Photography
30+ Historic Tunnels
More than 30 tunnels excavated in living rock that preserve the magic of the old mining railway.
🚇 History 🔦 Adventure
Charming Villages
Visit Teverga, Quirós or Proaza. They are mandatory stops to recharge your batteries and enjoy authentic local gastronomy.
🏡 Villages 🍽️ Gastronomy
Diverse Wildlife
In addition to bears, you can spot otters in the rivers, deer, wild boar, foxes and a wide variety of birds of prey.
Wildlife Birds
Location & Transport
How to Get to the Bear Trail
Travel Times
- From Oviedo: 25 min.
- From Gijón: 42 min.
- Bus (ALSA): Stop at Proaza / Buyera.
How to explore?
The Bear Trail: On Foot or by Bicycle?
Two distinct ways to connect with Asturian nature. You decide the pace: the agility of pedals to cover more ground, or the calmness of each step to soak in every detail.
By Bicycle
Cover greater distances with the fresh breeze on your face. The favorite choice for exploring the whole valley.
- Shuttle service to the route's starting point
- Local bike rentals starting from €20-22
- Complete the full trail in about 2 to 3 hours
- Suitable for all ages and fitness levels
- Full safety gear: helmet and lights included
On Foot
The essence of hiking. Take your time to listen to the river and spot wildlife along the path.
- Flexible sections from 2km to full treks
- Pausable rhythm, perfect for families and pets
- Recommended: Buyera - Proaza - Tuñón trail
- 100% Accessible for strollers and reduced mobility
- Local transport return points (ALSA bus service)
Adventure for everyone
The Bear Trail with Family
A natural paradise designed for the enjoyment of both adults and children. The key to an unforgettable experience with kids is planning and choosing the right section for their needs.
Recommended Section
Buyera → Bear Enclosure → Proaza → Tuñón
The perfect route: Just 6-7 km of practically flat terrain. This area has the greatest attractions: you'll see the bears, cross iconic wooden bridges and enter the most spectacular tunnels.
Estimated Time
Calculate a pace of about 3 km/h. Covering the Buyera-Tuñón section will take you about 2.5 hours of leisurely walking.
Baby Strollers
The compact gravel surface is suitable for strollers. We recommend models with large wheels (all-terrain).
Returning Home
If you don't want to walk back, you can use the ALSA bus or book a local adapted taxi.
Tunnel Safety
Always walk on the right. It is advisable to carry your own headlamp for better visibility in tunnels.
Tour by stages
The Bear Trail Sections
The trail is mainly divided into 3 well-defined sections. You can do them separately or join them according to your level.
Ready for adventure?
Plan your visit with us
We help you organize your excursion to the Bear Trail: accommodation, routes and activities adapted to your group and budget.
Reasons to visit
Why visit the Senda del Oso
Unique Historical Heritage
Walk an authentic 19th-century railway route. You will cross more than 30 picturesque illuminated tunnels carved into the living rock.
Home of the Brown Bear
In the nearby Proaza Bear Enclosure, you can observe Molina and Paca in a recovered environment. A unique opportunity in the Cantabrian zone, ideal for kids.
100% Accessible to Everyone
A mostly flat and well-paved route, exceptional for crossing by bike, walking with family with children, carrying strollers and for people with reduced mobility.
Breathtaking Landscapes
The trail passes between giant rock walls like in Valdecerezales or Peñas Juntas, and goes along the freshness and relentless natural sound of the Trubia river.
What they say about us
Real reviews from our visitors
A
"Great experience. We rented bikes to do the Bear Trail and they explained everything very well and were very friendly. Highly recommended."
G
"Cycling the Senda del Oso with friends and family is one of those experiences that stay with you forever. Spectacular route."
J
"Totally recommended. Simple route to do and with amazing views and landscapes!! Very friendly and professional staff."
What equipment to bring to the Bear Trail (Asturias)?
From lasendadeloso.es we recommend bringing the essentials to enjoy the Bear Valley without setbacks. Here is a practical and downloadable checklist to prepare your route.
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Quick tips — The Bear Trail is a route with little slope, but the weather in Asturias can vary quickly.
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.
Where can I park?
There are several free parking lots at the starting points: Tuñón, Entrago, and Proaza. In high season they fill up early; we recommend arriving before 9am.
When is the best time to do the Bear Trail?
The route is practicable all year round, but spring (April-June) and autumn (September-October) offer the best temperature and landscape conditions.