The Sidrón Cave is a non-carboniferous limestone karst cave system located in the Piloña municipality of Asturias, northwestern Spain, where Paleolithic rock art and the fossils of more than a dozen Neanderthals were found. Declared a "Partial Natural Reserve" in 1995, the site also serves as a retreat for five species of bats and is the place of discovery of two species of Coleoptera.
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Official Website https://www.turismoasturias.es/descubre/naturaleza/espacios-protegidos/cueva-del-sidron
Address 33534, Spain
Coordinates 43°22'57.494" N -5°19'23.406" E