Object description

El Soplao is a cave located in the municipalities of Rionansa, Valdáliga and Herrerías in Cantabria, Spain. It is considered unique for the quality and quantity of geological formations in its 17 miles length, 6 of which are open to the public. In it are formations such as helíctites and curtains . Its formation dates back to the Mesozoic, in particular the Cretaceous period 240 million years ago. The entrance is at 540 metres in the Sierra Soplao Arnero.