21
riders
3
rides
Gravel biking around Altzo, located in the Gipuzkoa province of Spain, offers routes characterized by significant elevation changes and varied terrain. The region features a landscape of rolling hills and valleys, often covered in dense woodland, providing a challenging environment for gravel cyclists. Routes frequently traverse rural roads and tracks, connecting small towns and natural features. The area's topography ensures that most gravel bike trails in Altzo include substantial climbs and descents.
Last updated: July 3, 2026
10
riders
110km
07:04
1,760m
1,760m
Hard gravel ride. Very good fitness required. Mostly paved surfaces. Suitable for all skill levels.
5
riders
36.8km
02:50
780m
780m
Hard gravel ride. Very good fitness required. Mostly paved surfaces. Suitable for all skill levels.

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3
riders
28.4km
02:27
860m
860m
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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Great route for beginners as has mainly constant and light slopes. Only half a dozen uphills the first 30 km from Pamplona.
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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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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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A must when you pass through this area. Stopping and having a coffee is almost mandatory. 😉
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One of the best greenways we know.
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This beautiful city located in the valley of the Oria River is surrounded by small mountains and green meadows. Thus, it offers you the possibility of escaping from the noise of the city in a few minutes. Furthermore, in its historic center is the church of San Martín de Tours, which is undoubtedly worth a visit.
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Great tour always along the river and through countless tunnels. Also recommended in hot weather. Bring light if possible.
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Gravel biking around Altzo is characterized by challenging routes. All listed trails are classified as difficult, featuring significant elevation changes and varied terrain, making them best suited for experienced riders.
You can expect a diverse landscape of rolling hills and valleys, often covered in dense woodland. Routes frequently traverse rural roads and tracks, with substantial climbs and descents throughout the region.
Yes, some routes pass by interesting landmarks. For instance, the long-distance route Santa Cruz Tunnel – Witches' Bridge loop from Tolosa includes the Santa Cruz Tunnel and the historic Witches' Bridge. You might also encounter the Plazaola Greenway on some sections.
There are at least 5 gravel bike trails detailed for the Altzo area, all offering challenging experiences for riders.
The routes in Altzo feature significant elevation gain. For example, the Free Climbing – Andoain loop from Asteasu involves nearly 900 meters of ascent over its 46.5 km distance.
Yes, many of the gravel bike routes around Altzo are designed as loops. Examples include the Olantza Borda – Berrobi loop from Tolosa-Centro and the Gaztelu Church – Berrobi loop from Tolosa, allowing you to start and finish at the same point.
Given the region's varied terrain and potential for dense woodland, spring and autumn generally offer the most pleasant conditions with milder temperatures and vibrant scenery. Summer can be warm, and winter might bring more challenging weather.
Due to the difficult classification and significant elevation changes of all listed routes, the gravel bike trails directly around Altzo are generally not recommended for families with young children or beginner cyclists. They are better suited for experienced riders.
While specific parking facilities for each trailhead are not detailed, routes often start from towns like Tolosa or Asteasu. You would typically look for public parking options within these towns to access the starting points of the trails.
Accessing the starting points of these routes, such as Tolosa or Asteasu, by public transport is generally possible. However, policies regarding bikes on public transport (trains or buses) can vary, so it's advisable to check with local transport providers in Gipuzkoa beforehand.
The longest gravel bike route is the Santa Cruz Tunnel – Witches' Bridge loop from Tolosa, spanning 109.3 km (67.9 miles) with over 1700 meters of elevation gain.
More than 30 gravel bikers have explored the routes in Altzo using komoot, indicating a community of riders who appreciate the region's varied and challenging terrain. They often highlight the difficult nature of the routes and the rewarding climbs.
The routes traverse rural landscapes and connect small towns. While specific cafes are not listed, starting points like Tolosa offer amenities. For example, the Old Bridge – Tolosa Train Station loop from Ikaztegieta passes through areas where you might find local establishments.


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