Best caves around Aránzazu are found within the Aizkorri mountain range, offering a subterranean world of geological formations. This region is characterized by its natural landscapes and significant cave systems. The area provides opportunities to explore various cave types, from accessible tunnels to challenging chasms.
Last updated: July 4, 2026
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Lezabaltz (from "leza" (chasm) and "baltz" (black) in the local Basque) is the name given to one of the ten access points to the Austegiarmin karst drainage network. It is an impressive chasm, with a wide mouth and 35 meters deep, well known to the shepherds of the main sheepfold in Orozko (Bizkaia), whose huts are located just over 100 meters away in a straight line. Be very careful!
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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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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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In the rainy season, you may not be able to cross the tunnel without getting your feet wet. But it is impressive to find this at the beginning.
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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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Beautiful area, it is recommended or almost mandatory to carry a flashlight, since although the cave is short and does not involve much difficulty, it is always good to see where you put your feet
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The region offers a variety of fascinating subterranean experiences. For a guided tour through impressive geological formations and significant paleontological discoveries, consider the Arrikrutz Caves, where you can see an underground river and learn about ancient cave bears and lions. If you're seeking a more adventurous, self-guided exploration, the Supelegor cave is known for its huge mouth and accessible interior, though a flashlight is essential.
Yes, the Aitzbitarte Caves, located on Aitzbitarte Hill, are renowned for their prehistoric rock art. These Paleolithic caves contain significant engravings of animals like bison, horses, and aurochs, offering a rare glimpse into ancient human culture and artistic expressions from the Stone Age. While public access details for Aitzbitarte are not widely available, Arrikrutz Caves also hold immense paleontological significance with discoveries of ancient fauna.
The best time to visit depends on the specific cave. For publicly accessible caves like Arrikrutz Caves, check their official opening hours, which may vary seasonally. For natural, unmanaged caves such as Supelegor, dry periods are generally preferable to avoid slippery conditions or high water levels, especially if there's an underground river or potential for flooding.
The Arrikrutz Caves offer a family-friendly experience with guided tours through Gallery 53. The 500-meter route includes a 35-meter descent via a hanging walkway and modern dynamic lighting, making it an educational and engaging visit for most ages. Always check age or height restrictions directly with the cave management.
You can expect to see impressive geological formations such as stalactites and stalagmites, especially prominent in the extensive Arrikrutz Caves system. Some caves, like Arrikrutz, also feature active underground watercourses. Other natural caves, such as Supelegor, are notable for their vast entrances and natural rock formations.
Yes, some caves have restricted access. For instance, crossing the Abaro Tunnel and Baltzola Caves is currently prohibited due to the danger of contracting Q fever. Additionally, deep chasms like Sima Lezabaltz, which is 35 meters deep, require extreme caution and are generally only suitable for experienced cavers with proper equipment and permits.
The region around Aránzazu offers various outdoor activities. You can find numerous cycling routes, including touring bicycle, mountain biking, and gravel biking options. For example, explore routes like 'Forest Trail Near Bilbao – Path Along the Ibaizabal River' or 'Otzarreta Beech Forest – Alto de Dima loop'. You can find more details on these and other routes in the Cycling around Aránzazu, Traffic-free bike rides around Aránzazu, and Gravel biking around Aránzazu guides.
For guided tours like Arrikrutz Caves, comfortable walking shoes and a light jacket are usually sufficient as cave temperatures are consistently cool. For unmanaged caves such as Supelegor or Axlaor Cave, a reliable flashlight or headlamp is essential, and sturdy footwear with good grip is highly recommended due to uneven and potentially wet terrain.
The publicly accessible section of the Arrikrutz Caves, Gallery 53, is designed with a hanging walkway and modern lighting, making it relatively accessible for a guided tour. While it involves a 35-meter descent, the infrastructure aims to accommodate a wider range of visitors. Always confirm specific accessibility needs with the cave management beforehand.
Dog policies vary significantly between caves. Publicly managed caves like Arrikrutz Caves typically have restrictions on pets for safety and conservation reasons. For natural, unmanaged caves, while there might not be explicit bans, it's crucial to consider the safety of your dog due to challenging terrain, potential drops, and the presence of wildlife. Always keep dogs on a leash and ensure they do not disturb the natural environment.
For the Arrikrutz Caves, parking facilities are usually available near the visitor center, which is close to the Sanctuary of Arantzazu. For other natural caves like Axlaor Cave or Supelegor, access often involves hiking, and parking may be limited to trailheads or nearby villages. Public transport to the immediate vicinity of most natural caves is generally not available, requiring personal vehicle access or a combination of public transport and hiking.


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