Matienzo

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.

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