Caves around Atxondo are situated in the Durangaldea region of Bizkaia, an area characterized by natural beauty and Basque mythology. The municipality is located near the Urkiola Natural Park and Mount Anboto, which are prominent natural landmarks. This region features various geological formations, including natural tunnels and cave systems. The landscape offers opportunities for exploring both natural wonders and sites with cultural significance.
Last updated: May 23, 2026
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Impressive, both for its size and for being the best frame of Anboto.
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The best place to start the route to Alluitz.
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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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Spectacular view of Anboto from the Udalatx cave. (Very close to the top)
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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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Small cavity with inlet and outlet, although not practicable. Just below the rock in front of the top / hermitage / castle.
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The region offers a mix of natural caves and sites integrated with them. Key locations include the impressive Abaro Tunnel, the extensive Baltzola Caves system, and the Hermitage of the Holy Christ of Atxarte, which is situated above a cave. You can also find the San Martín Hermitage and Caves, and a unique View of Anboto from Udalatx Cave.
Yes, some cave-related sites are suitable for families. The Hermitage of the Holy Christ of Atxarte and the San Martín Hermitage and Caves are both categorized as family-friendly. The main entrance of the Baltzola Caves, known as Portalón de Baltzola, also offers parts suitable for family exploration, though a flashlight or headlamp is recommended.
Cave exploration in the Atxondo area ranges from accessible to challenging. The Abaro Tunnel and Baltzola Caves are generally considered challenging, with some passages now prohibited due to safety concerns like Q fever. Other sites like the Hermitage of the Holy Christ of Atxarte and San Martín Hermitage and Caves are more accessible, often involving walking to the cave entrance or exploring smaller sections.
The caves in this region are known for their geological formations. The Baltzola Caves, for instance, feature extensive galleries, stalactites, and stalagmites, along with unique formations created by water erosion. The Ojo de Bentaneta is a notable karst cavity visible from the Arrazola greenway, showcasing the area's geological activity.
Yes, the region is rich in cultural and mythological significance. The Hermitage of the Holy Christ of Atxarte is a historical religious building located above a cave. The Baltzola Caves are steeped in Basque mythology, with legends of mythical beings like the Gentilak and the serpent Sugaar. Mount Anboto, overlooking Atxondo, is home to Mari's Cave, the legendary abode of Mari, the principal deity of pre-Christian Basque mythology, making it a site of immense cultural importance.
The area around Atxondo offers diverse outdoor activities. You can find numerous mountain hikes, including challenging routes to Anboto and Udalatx. There are also various MTB trails and running trails available. For more details on routes, you can explore the Mountain Hikes around Atxondo, MTB Trails around Atxondo, and Running Trails around Atxondo guides.
Yes, several routes incorporate cave features. The easy walking route from the Indusi district leads to the Baltzola Caves, passing the Abaro natural tunnel. Mountaineers attempting Mount Anboto may encounter Mari's Cave. The Hermitage of the Holy Christ of Atxarte is also a popular starting point for routes to Alluitz.
For exploring caves like the Abaro Tunnel or parts of the Baltzola Caves, a flashlight or headlamp is highly recommended, as some sections lack natural light. In the rainy season, be prepared for wet conditions, as you may need to cross water in some tunnels.
Yes, the Baltzola Caves are a renowned destination for climbers, featuring numerous routes of varying difficulty, including some of the most challenging in Spain. The area around the Hermitage of the Holy Christ of Atxarte is also known as a climbing area.
Visitors appreciate the unique blend of adventure, natural beauty, and cultural immersion. The impressive natural tunnels and cave systems, combined with the rich Basque mythology and opportunities for hiking and climbing, are frequently highlighted. The komoot community has recognized these locations with 27 upvotes and 47 photos, indicating their appeal.
Yes, for safety reasons, passage through the Abaro Tunnel and Baltzola Caves is currently prohibited due to the danger of contracting Q fever. Signs are in place to warn visitors.
The Hermitage of the Holy Christ of Atxarte is categorized as dog-friendly, making it a suitable option for visiting with your pet. For other cave systems, it's advisable to check specific access rules or consider the terrain's suitability for dogs.


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