Cueva del Valle or Cave del Valle (Valley's cave in Spanish) is a cave located in the municipality of Rasines, Cantabria (Spain). It is also known by locals as "The Viejarrona." It has a large entry, which gives great majesty. It is born Silent River, a tributary of Ruahermosa, both of Assos. It is very important prehistoric as well as speleologic.
Although no paintings have been found inside, in 1905 the Presbyter Lorenzo Sierra discovered a very important reservoir of objects and pieces from different eras: Azilian (harpoons, scrapers ...); Upper Magdalenian points (spear of one or two rows of teeth and other various tools of bone. silex industry has mostly central chisels and various types of scrapers). This site also found a stick perforated great archaeological value has now disappeared, which is a copy in plaster at the National Archaeological Museum. Also there was another pole pierced less important than the former because they have no decoration is preserved in the Regional Museum of Prehistory and Archaeology of Cantabria.
The cave of the valley is recognized as one of the longest caves explored of the world with more than 40 miles explored is well known by practitioners of caving.