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Matienzo is the name of a village and a karst depression some 25 km southeast of Santander in Ruesga municipality, Cantabria, northern Spain. The limestone around Matienzo is riddled with caves (up to 58.6 km in length[1]) which have been extensively explored over the last 50 years by Spanish and British cavers.[2]

As of December 2016 the total length of cave passage explored, was 377 km.[1]

References

  1. ^ a b "Matienzo Caves Project".
  2. ^ Corrin, Juan; Smith, Peter (2010). Matienzo : 50 years of speleology = Matienzo : 50 años de espeleologia. Bacup, Lancashire, UK. ISBN 978-0-9566045-0-7. OCLC 700402496.((cite book)): CS1 maint: date and year (link) CS1 maint: location missing publisher (link)

43°18′47″N 3°34′56″W / 43.31306°N 3.58222°W / 43.31306; -3.58222