This is an incomplete list of caves in the United Kingdom, including information on the largest and deepest caves in the UK.
The longest cave system in the UK is the Three Counties System in the Yorkshire Dales, with 86.7 km (53.9 mi) of passageways.
[1] A sea cave on the north side of Calder's Geo in Shetland was measured in 2014 at over 20 metres (66 ft) high and with a floor area of around 5,600 square metres (60,000 sq ft).
This makes it the largest known cave chamber in the United Kingdom.
[4][5] A chamber in Reservoir Hole, Cheddar Gorge called “The Frozen Deep” was discovered in 2012 and found to be 30 metres (98 ft) high and 60 metres (200 ft) long.