Mossdale Caverns
The 21st deepest cave in the world
The 17th longest cave in the world
Mossdale Caverns is a cave system in the Yorkshire Dales, England. It is about 5 kilometres (3.1 mi) north of Grassington, and east of Conistone, where Mossdale Beck sinks at the base of Mossdale Scar. It lies at an altitude of 425 metres (1, 394 ft) on the eastern flank of Wharfedale, and extends south-east beneath Grassington Moor. The cave system is formed within the Middle Limestone of the Yoredale Series. The large stream (average flow 100 litres/second) has been shown by dye testing to resurge at Black Keld, some 4.4 kilometres (2.7 mi) to the WNW 225 metres (738 ft) lower. This cave system is within the Site of Special Scientific Interest called Black Keld Catchment SSSI.
Cave data from Wikidata (CC0). Summary from Wikipedia (CC BY-SA).