Matienzo

This article is about the Spanish village. For other uses, see Matienzo (disambiguation).

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^[update] the total length of cave passage explored, was 377 km.^[1]