This is an incomplete list of caves in the United Kingdom, including information on the largest and deepest caves in the UK. Longest, deepest and largest The longest cave system in the UK is the Three Counties System in the Yorkshire Dales, with of passageways. It includes the Ease Gill system, the Notts Pot / Ireby Fell Cavern system, the Lost John's Cave system, and the Pippikin Pot system, all of which are connected. The deepest cave in Wales and the UK is Ogof Ffynnon Ddu, deep and containing around of passageways. The deepest cave in England is the Three Counties System which is deep between the entrance of Large Pot, and the deepest point reached by diving in Gavel Pot. The deepest cave in Scotland is Cnoc nan Uamh ('hill of the caves') in Assynt, deep. The deepest cave in Northern Ireland is Reyfad Pot in County Fermanagh, deep. A sea cave on the north side of Calder's Geo in Shetland was measured in 2014 at over high and with a floor area of around . This makes it the largest known cave chamber in the United Kingdom. A chamber in Reservoir Hole, Cheddar Gorge called “The Frozen Deep” was discovered in 2012 and found to be high and long. England By English caving region. Devon See also Caves in Devon Ash Hole Cavern Bakers Pit, Buckfastleigh Chudleigh Cavern Kent's Cavern Kitley Show Cave Pridhamsleigh Cavern, Ashburton Reed's Cave Mendip Hills The following are all within Somerset unless otherwise stated. See also Caves of the Mendip Hills. Aveline's Hole Charterhouse Cave Cox's cave Eastwater Cavern GB Cave Goatchurch Cavern Gough's Cave Lamb Leer Longwood Swallet Manor Farm Swallet Pierre's Pot Reservoir Hole Rhino Rift Shatter Cave St Cuthbert's Swallet Stoke Lane Slocker Swildon's Hole Thrupe Lane Swallet Wookey Hole Caves Peak District The following are all within Derbyshire unless otherwise stated. See also List of caves in the Peak District and List of caves in Derbyshire. Blue John Cavern Great Masson Cavern Great Rutland Cavern Oxlow Cavern Peak Cavern Poole's Cavern Speedwell Cavern Thor's Cave, Staffordshire Titan Treak Cliff Cavern Yorkshire Dales Alum Pot Aquamole Pot Bar Pot, Gaping Gill Boxhead Pot Big Meanie (See Death's Head Hole) The Buttertubs Crackpot Cave Coal Hole Entrance (See Short Drop Cave) Death's Head Hole Disappointment Pot, Gaping Gill Ease Gill Caverns Eden Sike Cave, Mallerstang Flood Entrance Pot, Gaping Gill Gaping