4.7
(6)
76
riders
6
rides
Gravel biking around Zalduondo offers access to diverse natural landscapes within the Basque Country, serving as a gateway to the Aizkorri-Aratz Natural Park and the Sierra de Entzia. The region is characterized by varied topography, including limestone ridges, karst formations, extensive beech forests, and open pastures. These features provide a range of terrains suitable for gravel cycling.
Last updated: July 13, 2026
4.4
(5)
59
riders
127km
09:42
1,280m
1,280m
Hard gravel ride. Very good fitness required. Mostly paved surfaces. Suitable for all skill levels.
5.0
(1)
6
riders
41.2km
03:08
890m
880m
Hard gravel ride. Very good fitness required. You may need to push your bike for some segments of this route.

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2
riders
Hard gravel ride. Very good fitness required. Mostly paved surfaces. Suitable for all skill levels.
6
riders
42.5km
02:31
350m
340m
Moderate gravel ride. Good fitness required. Mostly paved surfaces. Suitable for all skill levels.
2
riders
Hard gravel ride. Very good fitness required. Mostly paved surfaces. Suitable for all skill levels.
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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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pedestrian walkways of the marsh nearby
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Beautiful views. Be careful if you're fishing on the bridge; it's very narrow and you could fall hard.
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There is light at the end of the tunnel... One yes and one no... But it looks perfect... The only thing that makes it look really cool.... Hahahahaha
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A long, non-floating bridge that spans the swamp from side to side. During the day, many fishermen
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Good area for walking or cycling
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Simple route for all audiences
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Gravel biking around Zalduondo offers a diverse range of terrains. You'll encounter limestone ridges and karstic formations, especially in the Aizkorri-Aratz Natural Park, providing engaging and sometimes challenging routes. There are also extensive indigenous beech forests and vast green meadows and pastures, offering shaded routes and open, scenic stretches for riders.
While many routes in the immediate Zalduondo area are rated as difficult, the nearby Sierra de Entzia nature reserve is known for trails with 'little elevation' and suitability for the 'general public.' These less strenuous paths through pastures and beech forests could offer more accessible options for families, though they are primarily hiking trails that may be suitable for gravel bikes.
The region is rich in history. A significant attraction accessible from Zalduondo is the San Adrián Tunnel, an ancient natural passage that's part of the Camino de Santiago and houses a small chapel. In Zalduondo itself, you can find the 17th-century Andoin-Luzuriaga Palace and medieval bridges like Zubizabal and Txaroste.
Yes, you can find routes that pass by water features and offer scenic views. For instance, the Ullíbarri-Gamboa Reservoir – Landa Recreation Area loop from Salvatierra/Agurain leads through reservoir areas. Additionally, the Tobería Waterfalls are a notable natural monument in the vicinity that could be incorporated into a ride.
The gravel bike trails directly around Zalduondo tend to be on the more challenging side. All four routes listed in this guide, including the Ormaiztegi Viaduct – Aztiria loop from Olaberri and the Marieta-Larrintzar – Azua Footbridge loop from Agurain, are rated as difficult. They often feature significant elevation changes and varied terrain.
The gravel biking routes around Zalduondo are highly regarded by the komoot community, with an average score of 5.0 stars from 7 reviews. Many riders appreciate the diverse terrain, from challenging limestone areas to serene beech forests, and the opportunities for both natural beauty and cultural exploration.
Yes, all the featured routes in this guide are circular, allowing you to start and end at the same point. Examples include the Ormaiztegi Viaduct – Aztiria loop from Olaberri and the Alto de Iturrieta (990 m) – Opakua Pass loop from Okariz, providing convenient options for your ride.
The region features several significant mountain passes and summits. You might encounter the Opakua Pass, which is part of the Alto de Iturrieta (990 m) – Opakua Pass loop from Okariz. Other nearby highlights include the Collado de Biozkorna and the Leizarrate Summit (1,053 m).
There are at least 4 distinct gravel bike trails detailed in this guide for the Zalduondo area, all of which are rated as difficult. These routes offer a variety of distances and elevations for experienced gravel bikers.
The Basque Country, including Zalduondo, generally offers pleasant conditions for cycling during spring and autumn, when temperatures are moderate and the natural landscapes are vibrant. Summer can also be good, though some routes might be more challenging in higher temperatures. Winter riding is possible but be prepared for potentially wet conditions, especially in higher elevations.
Yes, Zalduondo serves as an excellent gateway to the Aizkorri-Aratz Natural Park. The park is specifically recognized for its gravel biking routes, featuring diverse landscapes from dramatic karstic formations to extensive beech forests. Routes from Zalduondo can lead you directly into the heart of the park's varied terrain.
For experienced riders looking for longer distances, the Ullíbarri-Gamboa Reservoir – Landa Recreation Area loop from Salvatierra/Agurain is a challenging option, covering 73.8 km and typically taking around 6 hours to complete. This route offers extensive riding through reservoir areas and recreation zones.


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