Bournillon Cave

The Bournillon Cave (French: grotte de Bournillon) is located in the commune of Châtelus in the Isère Department of France, in the Vercors Massif. Its entrance is 105 metres (344 ft) high, and 60 metres (200 ft) wide, and is the largest in Europe. It is one of the main karst springs of Vercors, with a maximum flow rate of 80 cubic metres (2, 800 cu ft) per second, which feeds a hydroelectric plant.

Cave data from Wikidata (CC0). Summary from Wikipedia (CC BY-SA).