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.
Last updated: April 29, 2026
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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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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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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.
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.
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.
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.
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.
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.
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.
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.
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.
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.
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.
For more general information about the caves in Biscay and the surrounding region, you can visit the official tourism website: visitbiscay.eus.


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