Guided Caving in the Urdaibai Biosphere Reserve

Context Caving in the UNESCO-designated Urdaibai Biosphere Reserve offers access to a remarkable subterranean world shaped by unique karst formations. Located along the Basque coast, this region blends marshlands, sea cliffs, and limestone caves within a protected natural landscape rich in biodiversity. The explored galleries extend up to 500 meters, maintaining a constant, cool temperature of 12–14°C, creating a consistently fresh and humid environment.

The Experience Accompanied by expert guides, you’ll navigate narrow underground passages where stalactites and stalagmites have sculpted intricate mineral landscapes over time. The soft echo of dripping water follows each step as you move through chambers and tunnels. Technical gear, including helmets and safety equipment, is provided, and guides offer insights into local geology and subterranean wildlife, deepening your connection to this hidden world.

For Whom This activity suits individuals in good physical condition with prior experience in similar environments, as well as children over 8 years old when supervised. It is not recommended for those with limited mobility or sensitivity to cold, damp conditions.

Local Context Urdaibai is a region where traditional fishing and farming coexist with environmental conservation. Local guides, deeply familiar with the ecosystem, share knowledge of both cultural heritage and natural value, reinforcing respect for this protected area and its ecological richness.