Expreso de la robla train passing along Ojo Guareña natural monument. Las Merindades, Burgos. Spain. The Ojo Guareña Karstic Complex is, with its alm


Expreso de la robla train passing along Ojo Guareña natural monument. Las Merindades, Burgos. Spain. The Ojo Guareña Karstic Complex is, with its almost 100 km of development, the largest set of caves in the Iberian Peninsula and one of the 10 largest in the world. The presence of various levels, some of which are fossilized and others are hydrologically active, endow this area of the Complex with extraordinary morphological, hydrological, scientific, and didactic interest. Inside, several prehistoric sanctuaries and 63 species of cave invertebrates have been found, of which 4 are exclusive to these caves.


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Photo credit: © Sergi Reboredo / Alamy / Afripics
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