Best natural monuments around Zerain are found within the Aizkorri-Aratz Natural Park, a significant natural area in the Basque Country. This region is characterized by dramatic limestone mountains, extensive beech forests, and diverse karstic phenomena. The landscape features distinctive ridges, sinkholes, and ravines, offering a varied natural environment. Zerain serves as a gateway to these geological and ecological characteristics.
Last updated: June 4, 2026
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What's the deal with the names? Are "aketegi" and "aitxuri" the same thing?
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This year with the heavy rainfall, some mud and water obstacles are a challenge or a lot of work to clean the shoes 😁
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One of the highest points in the Basque Country, let yourself be enveloped by the fog and it will seem like a magical place.
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A place to remember, a joy to visit.
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A delightful and very quiet trail. I understand that is where the name "hidden path" comes from.
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Beautiful place, I recommend doing that route.
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On this tour that offers great natural wealth, you can discover the Arantzazu canyon, the forests and meadows of Iturrigorri and Bellotza.
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Zerain is nestled within the Aizkorri-Aratz Natural Park, offering dramatic limestone mountains, extensive beech forests, and diverse karstic formations. You'll encounter distinctive ridges, sinkholes, and ravines, alongside verdant pastures and open fields like the Urbia Depression, known for its panoramic views.
Yes, the San Adrián Tunnel is a historically significant natural pass within the Aizkorri-Aratz Natural Park. This natural tunnel, formed in the karstic landscape, has been traversed by an ancient road, part of the Camino Real and St. James' Way, for centuries. Archaeological remains, including Bronze Age artifacts, have been found here.
For breathtaking panoramic views, consider hiking to the summits. The Aizkorri Summit (1,523 m) offers expansive views of Guipúzcoa and Álava. Similarly, Aketegi Summit, part of the Aizkorri mountain range, provides stunning vistas of the surrounding landscape. The Urbia Depression also offers wide-open, picturesque views.
The natural monuments around Zerain are ideal for various outdoor activities. You can explore numerous hiking trails, including challenging ascents to summits like Aizkorri and Aketegi. There are also opportunities for running, cycling, and gravel biking. For more detailed routes, check out the guides for Running Trails around Zerain, Cycling around Zerain, and Gravel biking around Zerain.
Yes, the Hidden Path (PR-Gi 3005) is an intermediate trail that takes you through a rich natural environment. On this route, you can discover the Arantzazu canyon, as well as the beautiful forests and meadows of Iturrigorri and Bellotza.
The Aizkorri-Aratz Natural Park is beautiful year-round. Spring and autumn offer pleasant temperatures for hiking and vibrant natural colors. Summer is also popular, though some higher areas can be exposed. Winter can bring snow to the summits, offering a different, more challenging experience for those prepared for colder conditions.
The Aizkorri-Aratz Natural Park is the second-largest natural park in the Basque Country, distinguished by its dramatic limestone mountains and extensive beech forests. It's renowned for its diverse karstic phenomena, including ridges, sinkholes, and ravines. The park also supports a rich array of flora and fauna, notably a large colony of griffon vultures, making it ideal for exploring diverse ecosystems.
Visitors frequently praise the stunning panoramic views from summits like Aizkorri and Aketegi, often describing them as some of the best in Guipúzcoa and Álava. The unique blend of natural geology and rich history found at sites like the San Adrián Tunnel is also highly appreciated, offering a journey through a passage used by pilgrims for centuries.
Yes, several challenging summit hikes are available. The Aizkorri Summit (1,523 m) is a popular and challenging ascent. Another significant peak is Aratz Summit (1,445 m), which offers a rewarding climb with beautiful views, though its crest can be quite windy.
Yes, the Urbia Depression, located within the Aizkorri-Aratz Natural Park, is known for its expansive open fields dotted with modest shepherds' huts. Here, you can witness traditional pastoral life amidst a stunning natural backdrop, often seeing sheep grazing from spring to autumn.
The Aizkorri-Aratz Natural Park is home to a rich array of fauna. Most notably, it hosts a large colony of griffon vultures, which can often be seen soaring above the mountains. The diverse ecosystems also support various other bird species, mammals, and insects typical of mountainous and forested regions.
While Aizkorri Summit is very popular, Aketegi Summit, though part of the same range, is often less crowded and still provides absolutely impressive views. Similarly, Aratz Summit is separated from the main Aizkorri massif and offers a beautiful, perhaps quieter, experience.


Extend your search for the best caves by checking out these guides of the top ones around Zerain: