Caving regions
There are other caving areas in Scotland that do not posses any caves that are notable enough to be included in this database. The Appin and Arran regions contain many caves, but the longest is only 250 m and the deepest is only 48 m. The book "Caves Of Skye" by the Grampian Speleological Group (1995 ISBN 0 9513901 0 4) shows two caves over 300 m and several shorter. The longest and deepest is 376 m long and 23 m deep. The highest pitch is a blind surface shaft 12 m deep, of which 6 m is usually free climbed.
The Isle Of Man and the Channel Islands both contain some short caves. Many are sea caves.
The chalk coast between Margate and Eastbourne contain a few chalk solutional caves (not sea caves), that are substantially longer than other chalk caves manage to get (chalk is usually too unstable for caves to remain navigable by humans for any significant length). The longest is 350 metres, but is slowly being cut into pieces as the cliff in which it is located is slowly eroded by the sea.
Special interest caves
Pol-An-Ionain in Co. Clare, RO Ireland, is 550 m long. It contains almost no calcite decorations throughout except in the main chamber where a 6.7 m long stalactite hangs from the centre of the ceiling. This is the "Soggy Dishcloth". For a long time it was the longest known free hanging stalactite in the World, and although it has since been superseded by a few others, it is still one of the longest, and still holds the length record for UK and Ireland. What makes it more impressive is the fact that the stalactite is held on by a section of calcite less than 0.3 m square. The cave has now been converted into a show cave (confusingly called 'Doolin Cave'), which it has always been argued would put the stalatite at risk.
Box Freestone Quarries in Mendip is the second longest mine in Britain, and the longest in England, with over 90 km of known passage. Several sections of the mine were used for military storage during the Second World War, and were off-limits. The largest chamber is 60 m long, 8 m wide and 30 m high. The mine has been in use since Roman times.
Westbury Brook Cavern (or Mine) and Wigpool Iron Mine are both similar to Clearwell Caves in the respect that they both are artificially enlarged natural passages. However, in neither case is the naturally connected passage length or depth known so these are not included in the main database. If I get information to suggest that they should be included, I will include them, but I will need proof.