The famous Gaping Gill cave on Ingleborough in the Yorkshire Dales, UK. It has a massive cavern and the longest drop of any waterfall in the UK, at around 300 feet.

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Photo credit: © Ashley Cooper / Alamy / Afripics
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Keywords: austwick, cave, cavern, caving, dales, gaping, gill, hill, hole, holing, ingleborough, limestone, moor, moorland, pot, rock, sink, speleology, stream, uk, yorkshire