The Devil's Grinding Mill, sometimes known as the Devil's Hole, is part of The Angel's Drainpipe, a partially collapsed

cave Caves or caverns are natural voids under the Earth's Planetary surface, surface. Caves often form by the weathering of rock and often extend deep underground. Exogene caves are smaller openings that extend a relatively short distance undergrou ...

system on the River Eden in England, which forms dramatic gorges and

natural arch A natural arch, natural bridge, or (less commonly) rock arch is a natural landform where an arch has formed with an opening underneath. Natural arches commonly form where inland cliffs, Cliffed coast, coastal cliffs, Fin (geology), fins or Stack ...

es. It is south of

Kirkby Stephen Kirkby Stephen () is a market town and civil parish in Cumbria, England. It lies on the A685 and is surrounded by sparsely populated hill country, about from the nearest larger towns, Kendal and Penrith. The River Eden rises away in the pea ...

, within Stenkrith Park. The water moving with the caves and gorges produces an incessant roar. Geologically it is unusual as it has formed not in true limestone, but in brockram, a

breccia Breccia ( , ; ) is a rock composed of large angular broken fragments of minerals or Rock (geology), rocks cementation (geology), cemented together by a fine-grained matrix (geology), matrix. The word has its origins in the Italian language ...

of limestone fragments within sandstone. In 1828 it was visited by a travel writer who remembered it as follows (some of the details and spellings have changed or been misremembered by the author):

References

{{reflist Geology of Cumbria Natural arches of England Caves of Cumbria Kirkby Stephen