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Basque Country

Biscay

Top 12 Caves in Biscay

Best caves in Biscay are found within the Basque Country of Spain, a region characterized by its diverse natural landscapes and rich geological history. The province features a captivating array of caves, offering insights into ancient human presence and unique geological formations. These underground sites are often nestled within natural parks and biosphere reserves, showcasing the area's natural beauty. Biscay's caves provide opportunities to explore both archaeological treasures and impressive speleothems.

Best caves in Biscay

  • The most popular caves include Ezkerraldea Mining Museum, a historical site that was formerly the offices of a main iron extraction area. This abandoned mining area is now the heart of the protected Ezkerraldea Biotope.
  • Another must-see spot is Baltzola Caves, an impressive cavity known for its intricate karst labyrinth. This complex features large caverns shaped by thousands of years of erosion.
  • Visitors also love Supelegor, a cave noted for its huge entrance and ease of exploration. It is considered one of the most beautiful caves due to its location and scale.
  • Biscay is known for its archaeological caves, geological formations, and natural monuments. The region offers a variety of caves to explore, from those with Paleolithic paintings to those with unique stalactite formations.
  • The caves in Biscay are appreciated by the komoot community, with 26 upvotes and 47 photos shared by users.

Last updated: April 29, 2026

Abaro Tunnel

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Like the Baltzola caves, it is now prohibited to cross them, due to the danger of Q fever.

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Kortezubi is a municipality that preserves an extensive landscape, ecological and cultural heritage. It was chosen by our ancestors as a home and residence in prehistoric times, undoubtedly attracted by the abundance of resources and the comfort of its many caves. Proof of this is the Santimamiñe Cave. It enjoys a landscape open towards the estuary and secluded in the interior valleys, with walks and routes that immerse you in an exceptional landscape.
More info at: turismourdaibai.com/es/kortezubi

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Ezkerraldea Mining Museum

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Former offices of one of the main iron extraction areas in the region. Currently the heart of the Ezkerraldea Biotope. A space protected by its categorization of the land.

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Supelegor

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One of the most beautiful caves I have ever seen. First because of the location, second because of the small challenge of not getting lost to get there, and thirdly because it is super cool: a huge mouth and easy to travel (with a flashlight) a good stretch. Absolutely recommended.

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Baltzola Caves

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Impressive cavity, until a while ago you could go through. They have recently put up a sign, warning of the danger of contracting Q fever, and the passage is prohibited.

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Hermitage of the Holy Christ of Atxarte

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The best place to start the route to Alluitz.

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CuevaDeLaPuertaDeHierro

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It can only be accessed one or two meters, but it is interesting.

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CuevasDelPagasarri

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Really, I only found a cave, but it was curious to see

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Cave inside the so-called Great Central Crack, in the Itzina Massif. Its interior can be accessed by descending the ramp of the natural tunnel from the mouth of Axlegor, municipality of Orozko (Bizkaia).

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Galleries of the Iron Belt

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You can go on an excursion with the children carrying flashlights through the galleries of the iron belt, it will be an unforgettable experience.

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Tips from the Community

oscargynko
April 7, 2025, Ermita del Santo Cristo de Atxarte

The best place to start the route to Alluitz.

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A climb with a lot of mud and slippery since it had rained the day before

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oscargynko
September 16, 2024, CuevasDelPagasarri

Small but charming, and very close to the top.

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It can only be accessed one or two meters, but it is interesting.

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Located above a cave, this hermitage is next to the river and the old road that connected with the Cantabrian coast and Duranguesado. It is located next to a climbing area.

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Like the Baltzola caves, it is now prohibited to cross them, due to the danger of Q fever.

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This part of the Baltzola caves was normally the exit.

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Impressive cavity, until a while ago you could go through. They have recently put up a sign, warning of the danger of contracting Q fever, and the passage is prohibited.

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Frequently Asked Questions

What unique geological features can I see in Biscay's caves?

Biscay's caves offer diverse geological wonders. Baltzola Caves are known for their intricate karst labyrinth and large caverns shaped by erosion. Pozalagua Cave, though not listed as a highlight in the guide, is renowned for one of the largest concentrations of eccentric stalactites (helictites) globally, creating surreal, gravity-defying formations. Supelegor is noted for its impressive scale and huge entrance.

Are there caves in Biscay with historical or archaeological significance?

Yes, Biscay is rich in archaeological caves. Santimamiñe Cave Paintings, Kortezubi, a UNESCO World Heritage site, features Paleolithic cave paintings depicting animals, offering a glimpse into Stone Age life. While direct access to the paintings is restricted for conservation, a virtual tour is available, and visitors can explore the excavation site. The Ezkerraldea Mining Museum is a historical site that was formerly the offices of a main iron extraction area, now the heart of the protected Ezkerraldea Biotope.

Are there family-friendly caves to visit in Biscay?

Yes, some caves in Biscay are suitable for families. The San Martín Hermitage and Caves are categorized as family-friendly. While specific accessibility details vary, caves like Supelegor, with its huge entrance and ease of exploration, can also be a good option for families with appropriate gear.

What should I wear or bring when exploring caves in Biscay?

When visiting caves in Biscay, it's recommended to wear appropriate footwear for uneven terrain, carry a torch or headlamp for visibility, and dress warmly due to the consistent cool temperatures underground, even in summer.

Are there any caves in Biscay that require special permits or reservations?

Yes, visits to Santimamiñe Cave Paintings, Kortezubi typically require prior reservation and are often guided due to conservation efforts. It's advisable to check ahead for specific requirements for other sites as well.

What outdoor activities or hiking routes are available near Biscay's caves?

Many caves in Biscay are located within natural parks, offering excellent opportunities for outdoor activities. For instance, you can find various hiking routes in the region, such as those listed in the Hiking in Biscay guide, or explore Waterfall hikes in Biscay. The Hermitage of the Holy Christ of Atxarte is located next to a climbing area, and the Baltzola complex is also known as an exceptional climbing site.

Can I explore challenging or adventurous caves in Biscay?

Yes, Biscay offers options for more adventurous cave exploration. The Baltzola Caves complex is an intricate karst labyrinth. The Abaro Tunnel and CuevaDeLaPuertaDeHierro are categorized as challenging. Axlaor Cave in the Itxina Massif also offers an adventurous experience, accessed by descending a natural tunnel ramp.

Which caves in Biscay are known for their impressive entrances or scale?

Supelegor, located in the Itxina Massif, is particularly noted for its impressive and huge entrance, making it relatively easy to navigate a good stretch inside with a flashlight. Many visitors consider it one of the most beautiful caves due to its scale.

Are there any restrictions or safety warnings for exploring certain caves in Biscay?

Yes, some parts of the Baltzola Caves, such as the Abaro Tunnel, have had crossing restrictions due to the danger of Q fever. Always check local signage and official information before attempting to enter restricted areas. It's also crucial to respect conservation and preservation regulations in all caves.

What is the best time of year to visit caves in Biscay?

Caves generally maintain a consistent cool temperature year-round, making them a viable option in any season. However, access to some caves or surrounding trails might be affected by weather conditions, especially heavy rain. It's always best to check specific cave opening hours and accessibility before planning your visit.

Are there any caves in Biscay that are also associated with religious or historical buildings?

Yes, the Hermitage of the Holy Christ of Atxarte is located above a cave, next to a river and an old road. Similarly, the San Martín Hermitage and Caves combine religious history with natural cave formations.

Where can I find more general information about caves in Biscay?

For more general information about the caves in Biscay and the surrounding region, you can visit the official tourism website: visitbiscay.eus.

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