**Ermittia cave** ::cuevas 
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The Ermittia Bekoa Cave, located on the slopes overlooking the Deba River, forms together with Aixako Zuloa one of the most extensive and complex underground networks in the Basque Country, with more than ten kilometres of explored passages. Its entrance—nothing more than a small, one-square-metre opening—gives no hint of the vast labyrinth that lies beyond: a multi-level system filled with fossil galleries, striking formations and exceptionally well-preserved fluviokarst deposits. In its deepest sections, the cave reaches the local water table, which connects to the Erribera Goikoa spring, highlighting the hydrological importance of this karst network within the Deba valley.
Ermittia Bekoa is also a demanding site for cavers, with narrow passages, drops and sections that require skill and experience. Inside, some of the most remarkable underground formations can be found: flowstone walls, twisted stalactites and small natural terraced pools created over thousands of years by mineral deposition. Speleology groups continue to document unexplored areas, making the cave a living environment under constant study. In addition, traces of prehistoric occupation have been identified in several parts of the network, adding significant archaeological and scientific value to this unique subterranean treasure of the Basque landscape.
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