4.7
(7)
102
riders
5
rides
Gravel biking around Gaztelu offers diverse terrain within the verdant Tolosaldea region of Gipuzkoa. The landscape is characterized by green mountains, extensive forests, and rolling hills, providing varied topography for cycling. Notable features include green valleys and the Plazaola Greenway, a repurposed railway path offering traffic-free routes. This environment supports a network of trails suitable for different skill levels.
Last updated: July 7, 2026
4.7
(3)
51
riders
45.4km
02:42
570m
570m
Hard gravel ride. Very good fitness required. Mostly paved surfaces. Suitable for all skill levels.
5.0
(2)
18
riders
31.1km
01:58
440m
440m
Moderate gravel ride. Good fitness required. Mostly paved surfaces. Suitable for all skill levels.

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4.5
(2)
12
riders
61.7km
04:24
1,210m
1,210m
Hard gravel ride. Very good fitness required. Mostly paved surfaces. Suitable for all skill levels.
10
riders
110km
07:04
1,760m
1,760m
Hard gravel ride. Very good fitness required. Mostly paved surfaces. Suitable for all skill levels.
3
riders
74.7km
04:47
1,170m
1,170m
Hard gravel ride. Very good fitness required. Mostly paved surfaces. Suitable for all skill levels.
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Popular around Gaztelu
As of May 24, 2026, the tunnel is closed. The alternative route is by road to the village of Leitza. From there, you take the greenway again.
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A bar with a view and good food, a good place to stop. Closed Mondays.
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Great route for beginners as has mainly constant and light slopes. Only half a dozen uphills the first 30 km from Pamplona.
0
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One of the ideal areas to start the Plazaola greenway
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Although you have to make a slight detour, it is worth visiting this bridge and taking a photo on it if you want.
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The 2700m tunnel is impressive and seems to never end. Advice: Bring clothes at least when passing through this tunnel as it is cool. Otherwise there is automatic lighting.
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That bridge is called "INTUIA-ko zubia" the INTUIA farmhouse is next to it. The misnamed "witches' bridge" is called UNANIBI-ko zubia, right in the Otita park (beginning of the Leitzaran valley). Don't forget to bring lights to cross the numerous tunnels in this valley!! Not to see but to be seen.
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There are currently 6 dedicated no-traffic gravel bike trails around Gaztelu, offering a range of distances and difficulties for you to explore the beautiful Basque Countryside.
The terrain around Gaztelu is characterized by green mountains, meadows, and dense forests, typical of the Tolosaldea region. You'll find varied topography, from relatively flat sections along greenways to more challenging climbs and descents through hills and valleys. The mild, rainy climate ensures a lush, verdant environment year-round.
While many routes in the area are rated moderate to difficult, the Plazaola Greenway – Santa Cruz Tunnel loop from Leitza is a moderate option that utilizes the accessible Plazaola Greenway. This repurposed railway path is known for being relatively flat and traffic-free, making it a good choice for families looking for a scenic ride along the Leitzaran river.
Thanks to its mild climate, gravel biking around Gaztelu is enjoyable for much of the year. Spring and autumn offer pleasant temperatures and vibrant scenery. Even in winter, the green environment persists, though you should be prepared for potentially rainy conditions, which contribute to the region's lush landscapes.
Yes, for experienced riders seeking a significant challenge, the Santa Cruz Tunnel – Witches' Bridge loop from Tolosa is a difficult route spanning over 110 km with substantial elevation gain. This route offers an extensive exploration of the region's varied terrain.
The komoot community highly rates the no-traffic gravel biking experience around Gaztelu, with an average score of 4.8 stars. Riders frequently praise the tranquil, traffic-free nature of the routes, the stunning green landscapes, and the diverse terrain that offers both scenic greenways and challenging climbs with views towards the Pyrenees.
Absolutely. Many of the no-traffic gravel routes around Gaztelu are designed as loops, allowing you to start and finish in the same location. Examples include the Witches' Bridge – Plazaola Greenway loop from Leitza and the Cantina del Plazaola – Plazaola Greenway loop from Leitza, both offering extensive circular tours.
Many routes traverse the verdant green valleys and extensive forests of the Tolosaldea region. At higher elevations, you can often catch glimpses of the majestic Pyrenees mountains. The Plazaola Greenway itself offers beautiful natural attractions along the Leitzaran river, providing a picturesque backdrop for your ride.
The longest no-traffic gravel bike trail currently available is the Santa Cruz Tunnel – Witches' Bridge loop from Tolosa, which covers an impressive distance of over 110 kilometers, making it ideal for a full day's adventure or bikepacking.
Yes, the Plazaola Greenway is a significant feature in the region, offering a fantastic traffic-free experience. Routes like the Plazaola Greenway – Santa Cruz Tunnel loop from Leitza and the Cantina del Plazaola – Plazaola Greenway loop from Leitza utilize this repurposed old railway path, which runs along the scenic Leitzaran river.
The gravel biking routes in the Tolosaldea region, including those around Gaztelu, often feature a mix of terrain. While focusing on no-traffic sections, you can expect segments ranging from well-maintained unpaved paths, like those on the greenways, to rural roads with minimal traffic that might include both paved and more challenging unpaved sections, providing a varied riding experience.


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