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Spain
Basque Country
Gipuzkoa
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Altzaga

The best gravel rides around Altzaga

5.0

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Gravel biking around Altzaga features routes characterized by significant elevation changes, traversing hilly terrain and offering challenging climbs. The region's landscape includes a mix of natural paths and historical infrastructure, such as viaducts and tunnels. These routes often lead through varied environments, from open areas with expansive views to more sheltered sections. The topography supports demanding gravel bike trails suitable for experienced riders.

Best gravel bike trails around Altzaga

  • The most popular gravel bike trail is Santa Cruz Tunnel –…

Last updated: July 5, 2026

10

riders

#1.

Santa Cruz Tunnel – Witches' Bridge loop from Tolosa

110km

07:04

1,760m

1,760m

Hard gravel ride. Very good fitness required. Mostly paved surfaces. Suitable for all skill levels.

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Hard

Hard gravel ride. Very good fitness required. You may need to push your bike for some segments of this route.

Hard
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Hard gravel ride. Very good fitness required. Mostly paved surfaces. Suitable for all skill levels.

Hard

Hard gravel ride. Very good fitness required. Mostly paved surfaces. Suitable for all skill levels.

Hard

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Tips from the Community

Koldo
January 2, 2026, Vía Verde de Mutiloa a Ormaiztegi

This area was a mining complex, the Mutiloa mining district, from the late 19th century. In 1911, 162 miners worked there, and in 1912, 34,500 tons of iron ore were stored and washed. After being transported by rail to Ormaiztegi, it was shipped to European steelworks. (https://www.mutiloakomeatzaritza.eus/es/la-via-verde/)

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Koldo
January 2, 2026, Ormaiztegi Viaduct

The Ormaiztegi Viaduct (inaugurated on August 15, 1864) is the town's most emblematic symbol. Designed by engineer Alexander Lavalley, a predecessor of Gustave Eiffel, it stands in a beautiful landscape overlooking the Eztanda River. It is the most important structure on the Madrid-Paris railway line, spanning 289 meters in length and 34 meters in height. Its 18,000 tons are supported by four pillars. The double track was installed in 1912 and electrified in 1928. It is currently disused and forms part of the Basque Country's cultural heritage.

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inakio
September 8, 2025, Plazaola Greenway

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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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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Frequently Asked Questions

How challenging are the gravel bike trails around Altzaga?

Gravel biking in Altzaga is characterized by significant elevation changes and hilly terrain, making most routes suitable for experienced riders. All four of the primary routes in the area are rated as 'difficult' due to challenging climbs and varied natural paths.

Are there any long-distance gravel biking options in Altzaga?

Yes, for those seeking a longer adventure, the Santa Cruz Tunnel – Witches' Bridge loop from Tolosa is a substantial 68.2 miles (109.8 km) route. It features over 1,700 meters of elevation gain and takes approximately 9 hours to complete, passing through notable landmarks.

What kind of scenery and landmarks can I expect on the gravel routes in Altzaga?

The routes often incorporate historical structures like viaducts and tunnels, such as the Ormaiztegi Viaduct. You'll also find varied environments, from open areas with expansive views to more sheltered sections. Notable attractions in the wider region include the Igartza Monumental Complex and the scenic Lareo Reservoir.

Are there any beginner-friendly gravel bike trails in Altzaga?

The gravel biking routes around Altzaga are primarily designed for advanced riders due to their challenging climbs and significant elevation changes. There are no routes currently rated as easy or moderate in this specific guide, so beginners might find these trails quite demanding.

What do other gravel bikers enjoy most about the trails in Altzaga?

The komoot community highly rates the gravel biking experience in Altzaga, with an average score of 5.0 stars. Riders often praise the challenging nature of the routes, the varied natural paths, and the unique experience of traversing historical structures like viaducts and tunnels.

Are there any routes that offer scenic viewpoints?

Absolutely. The Ormaiztegi Viaduct – View of Aztiria from Mutiloa loop from Beasain is known for its challenging ascents and offers several scenic viewpoints, including impressive vistas of the Ormaiztegi Viaduct itself. The region's hilly topography naturally provides many opportunities for expansive views.

Are the gravel bike trails in Altzaga typically loop routes?

Yes, all the featured gravel bike routes in Altzaga are designed as loops. This allows for convenient starting and ending points, such as the Ormaiztegi Viaduct – Lierni Path loop from Beasain, which offers a challenging experience through varied terrain.

Can I find any waterfalls along the gravel bike routes?

While not directly on every gravel route, the region around Altzaga is home to natural attractions like the Amezketa Stream Waterfall. You might consider combining a gravel ride with a short detour to visit such natural monuments.

What is the best season for gravel biking in Altzaga?

Given the significant elevation and varied terrain, spring and autumn generally offer the most pleasant conditions for gravel biking in Altzaga, with milder temperatures and beautiful scenery. Summer can be warm, and winter might bring colder temperatures and potentially wet or muddy conditions on natural paths, requiring appropriate gear.

Are there any routes that pass through or near towns where I can find amenities?

Some routes, like the Santa Cruz Tunnel – Witches' Bridge loop from Tolosa, start or pass near larger towns such as Tolosa, where you can find cafes, restaurants, and other services. The Gaztelu Church – Berrobi loop from Tolosa also begins from Tolosa, offering access to amenities before and after your ride.

Are there any routes that are easily accessible by public transport?

Routes that start from towns like Tolosa or Beasain, such as the Old Bridge – Tolosa Train Station loop from Ikaztegieta, may offer better public transport connections. It's advisable to check local train or bus schedules to these starting points for the most convenient access.

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