| 01Survey Name | Where to be found | Additional Information | |
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| 56 | BCRA-T, CC, LUSS | N. Spain | |
| 1623/142 | CUCC, CC, | Austria | |
| 1623/144 | CUCC, CC, | Austria | |
| 200 Metre Cave | SWETC | Norway | |
| Abbisso Cesare Prez | B237, | Italy | |
| Abisso Bologna | B237, | Italy | |
| Abisso C Fighiera | B237, BPC | Italy | |
| Abisso Cappa | B237, | Italy | |
| Abisso Dei Perdus | B237 | Italy | |
| Abisso Di Bifurto | BCRA-B, B237, Speleologica | Italy | |
| Abisso Enrico Davanzo | B237, | Italy | |
| Abisso Erialdo Saracco | B237, | Italy | |
| Abisso Eugenio Boegan | B237 | Italy | |
| Abisso Fiume Vento | Mondo Sotterraneo | Italy | |
| Abisso Gache | B237 | Italy | |
| Abisso Gianni Ribaldone | B237 | Italy | |
| Abisso L'Altro Mondo | Speleologica | Italy | |
| Abisso Luca Kralj | Speleologica | Italy | |
| Abisso Michele Gortani | B237 | Italy | |
| Abisso Modonutti Savoia | SI, Mondo Sotterraneo | Italy | |
| Abisso O Coltelli | B237, | Italy | |
| Abisso Perestroika | Speleologica | Italy | |
| Abisso Straldi | B237 | Italy | |
| Abisso Topino e le Giostre | Speleologica | Italy | |
| Abseil Cave | OUCC | N. Spain | |
| Achtundvierzigmeter Schacht | BSA-CS | Austria | |
| Actun Kaua | AMCS | Mexico | |
| Adelsberger Grotte | Mondo Sotterraneo | Italy | |
| Afon Meirchion Cave lower | B663 | NE Wales | |
| Agen Allwedd | CRG-P, CSS, SS,D,BSA-B, CC,SWCC, WP, MC, CWM, ISCA | S. Wales | |
| Aghirda Pothole | BPC | Cyprus | |
| Agia Trias | CC | Greece | |
| Agim Tem | BCRA-T | New Guinea | |
| Agua Carlata | CANC | Mexico | |
| Ahnenschacht | D, B237 | Australia | |
| Ahs Cave | GSG | Argyll | |
| Aigueta de Eriste | Espeleo Sie | Spain | |
| Aille River Cave | CPC, BEC | Co. Clare | |
| Aillwee Cave | B598, IS | Co. Clare | |
| Ain Melghfi | WSG | Morocco | |
| Ain Mizraq | BC | Lybia | |
| Ainahou Ranch Cave | BCRA-T | Hawaii | |
| Aisholt Quarry Cave | MCG | Mendip | |
| Aiyan Gaoyan | China Caves | China | |
| Akiyoshi Cave | B614P | Japan | |
| Alepotripa Cave | B295 | Greece | |
| Alfies Cave | BEC | ||
| Ali Sand Cave | GSG | ||
| Allt A'Chalda Mor Stream Cave | BSA, GSG | ||
| Allt Bealachuisge Cave | GSG | Argyll | |
| Allt Na Pairte Cave | MSG, GSG | Skye | |
| Allt Nan Leac Valley | D | Skye | |
| Allt Nan Uamh Stream Cave | CRG-T, SUMC, GSG, D | Sutherland | |
| Alsop Cave | CC | Derbyshire | |
| Altforscherschacht | IC | Austria | |
| Alum Pot | ULSA, CPC,SS, | Yorkshire | |
| Alva Silver Mines | GSG | Scotland | |
| Ampleforth Cave | BCRA-T | N. Yorkshire | |
| An60-Pozo Ryob'hilti | Regards | ||
| Ana Pe'ape'at Salamumu | NSS | Western Samoa | |
| Anchor Bay Cave | CDG | Malta | |
| Anchorte's Cave | ISCa | Llantrisant | |
| Andy Good Plateau, Caves of the | CANC | Canada | |
| Angels Drainpipe | MSG | Kirkby Stephen | |
| Angerholme Cave | GC | Wild Boar Fell | |
| Anglo-Russian Cave | CC | Russia | |
| Angunga Sink | SUSS | Papua New Guinea | |
| Anialarra | WCC | Spain | |
| Anne-A-Kananda | CANC | Tasmania | |
| A no.2 du Bois | SCAL | France | |
| Anou Boussouil | CRG-T, B237 | Algeria | |
| Anta - Cocha Cav | BSA-CS | ||
| Anta-Cocha Cave | CANC | Peru | |
| Antofts Hole | BSA-CS | ||
| Antofts Windypit | BCRA-T | N. Yorkshire | |
| Antonshellir | CDG | Iceland | |
| Antre Des Damnes | ICCC | Vercors | |
| Antro Del Corchia | D, CPC, BSA-B, BEC, YSS, BC, B237, WRPC, Speleologia, B681 | ||
| Apedale Hush Cave | MSG | ||
| Apogoeteftotripa | BCRA-CC | Greece | |
| Aquamole Pot | CPC | N. Yorkshire | |
| AR-3 | BCRA-CC | Crete | |
| Arc de sa Coma des Clot des Cero | Endins | Mallorca | |
| Arch Cave | CANC | Canada | |
| Arch Cave | CPC, | ||
| Arch Cave | BCRA-T | Norway | |
| Archerfield Caves | GSS | Scotland | |
| Arctomys Cave | SUSS, B237, D,CANC | Canada | |
| Argus Cave | GSG | Glen Stockdale | |
| Ariel Tunnel & Blacknor Fort | Dorset, D | ||
| Ariyorba Tem | BCRA-T | New Guinea | |
| Arnside, Caves of the Shoreline | B589 | Arnside | |
| Arriba Suyo Sotano | Mexico 85/86, BPC | Mexico | |
| Arrow Wood Caves | CPC | Helwith Bridge | |
| Arsendal Flood Sink / Resurgence | CSS | Norway | |
| Arthur's Cave | BC | Lancashire | |
| Artlish River Cave | CANC | Canada | |
| Arumvale Pipe/Cave | WSG | W. Australia | |
| Arymniok's Cave | BCRA-T | New Guinea | |
| Asenhola R5 | CSS | Norway | |
| Ashbed Hole | ISCA | ||
| Ashberry Windypits | BSA-CS, MSG, BCRA-T | ||
| Ashknott Hole | RRCPC | Forest of Bowland | |
| Ashtree Cave | RRCPC, BCRA-T | ||
| Asopladeru La Texa | BCRA-S | N. Spain | |
| Aspfjordgrotta | KCC | ||
| Assynt, Caves of | GSG | ||
| Atea Kananda | CI, SUSS | Papua New Guinea | |
| Atepolihuit De Nauzontla | CI | Mexico | |
| Atlalakia de Atikpak | AMCS | Mexico | |
| Atlantida tunnel | D | Lanzarote | |
| Attborough Swallet | BEC | Mendip | |
| August Hole | B014, SS | ||
| Aume du Pecher | CDG | France | |
| Australia Rift | Dorset | ||
| Avanc de Sant Hou | Espeleo Sie | Spain | |
| Avanc Dels Aragalls | Espeleo Sie | Spain | |
| Aven Cordier Event de Foussoubie | SCAL | France | |
| Aven David | SCAL | France | |
| Aven de L'ag 2004 | SCAL | France | |
| Aven de la Calcite | SCAL | France | |
| Aven de la Cigale | SCAL | France | |
| Aven de la Coupe | SCAL | France | |
| Aven de la Estagnolet | SCAL | France | |
| Aven de la Varade | CSS | France | |
| Aven de Mouret | RRCPC | ||
| Aven de Richard | CSS | France | |
| Aven des 2 Coules | SCAL | France | |
| Aven des 2 Cuistots | SCAL | France | |
| Aven des Abat-Jour | SCAL | France | |
| Aven des Cistes Cotonneux | SCAL | France | |
| Aven des Fourches | SCAL | France | |
| Aven des Neuf Gorges | SCAL | France | |
| Aven Despeysse Grotte de Saint Marcel | SCAL | France | |
| Aven du Berlingo | SCAL | France | |
| Aven du Bombyx Disparare | SCAL | France | |
| Aven du Double Decametre | SCAL | France | |
| Aven du Faisan | SCAL | France | |
| Aven du Mamelon 197 | SCAL | France | |
| Aven du Mas de la Roque | SCAL | France | |
| Aven du Petit Houx | SCAL | France | |
| Aven du Pince Cul | SCAL | France | |
| Aven du Retroviseur | SCAL | France | |
| Aven du Roncier | SCAL | France | |
| Aven d'Orgnac | SCP | France | |
| Aven Grotte Nouvelle de Vallon | SCAL | France | |
| Aven Hugo | SCAL | France | |
| Aven Jean Nouveau | SUSS, B237 | France | |
| Aven Mathieu | SCAL | France | |
| Aven Nicole | SCAL | France | |
| Aven No.1 du Croisement de Sainton | SCAL | France | |
| Aven No.1 du Retour | SCAL | France | |
| Aven Onabosse | SCAL | France | |
| Aven S E.90 F.M. | SCAL | France | |
| Aven U Terrus | SCAL | France | |
| Avenc Badalona | Cavernas | Spain | |
| Avenc Banc de Llorer | MCG | Mallorca | |
| Avenc de Barbuixell | Espeleo Sie | Spain | |
| Avenc de Femenia | Endins | Mallorca | |
| Avenc de la Bufona | Cavernas | Spain | |
| Avenc de la Foratata | Cavernas | Spain | |
| Avenc de la Gralles | Cavernas | Spain | |
| Avenc de la Punta | BCRA-T | ||
| Avenc de na Corna | Endins | Mallorca | |
| Avenc de Puig Caragoler | Endins | Mallorca | |
| Avenc de sa Botilla | Endins | Mallorca | |
| Avenc del Pla de Les Basses | ULSA | Mallorca | |
| Avenc dels Cans | Endins | Mallorca | |
| Avenc des Xuclamel | Endins | Mallorca | |
| Avenc Esqueixat | Endins | Mallorca | |
| Avenc Sants Sitges | Espeleo Sie | Spain | |
| Aygill Cavern | RRCPC, LS, ULSA, | Cumbria | |
| Ayleburn Mine Cave | CRG-T, D, MSG,LS, BSA-CS, B125, | ||
| B.102/2 (Jacque's dig) | CUCC | Pyrenees | |
| Baatskargrotta | BCRA-T | Norway | |
| Back Lane Quarry Cave | RRCPC, SS | Carnforth | |
| Backbone Pot | MSG | Vale of Eden | |
| Backdoor, The | CANC | Canada | |
| Badger Cave | YSS | Connisborough | |
| Badger Pot | IS | Co. Leitrim | |
| Bagshaw Cavern | BCRA-T, DCA, CC, CDG, D | Derbyshire | |
| Bagshawe Resergence Cave | CDG, D | Derbyshire | |
| Bakers Pit - Reeds Cavern | SS, BSA-CS | Devon | |
| Bakers Pit Cave | WP | ||
| Balatini Magarasi | IC | Turkey | |
| Balcarta | CSS | Czechoslovakia | |
| Balch's Cave | BEC, CSS | ||
| Balinka Pit | SWCC | ||
| Ballybeggan Pot | IS | Co. Kerry | |
| Ballynacourty Quarry Cave | MSG | Co. Waterford | |
| Ballynahallia Quarry Cave | CC | Co. Kerry | |
| Ballynahemery Cave | IS | Co. Waterford | |
| Ballynameela Caves | IS | Co. Waterford | |
| Ballynamintra Caves | IS | Co. Waterford | |
| Balma 3 de la Male | Endins | Mallorca | |
| Balma Balladora | Endins | Mallorca | |
| Balma de La Palonia | Endins | Mallorca | |
| Balma de sa Ceba Marina | Endins | Mallorca | |
| Balma de sa Pedrera de Guix | Endins | Mallorca | |
| Balma de sa Rapa | Endins | Mallorca | |
| Balma de sa Sitja | Endins | Mallorca | |
| Balma de ses Ortigues | Endins | Mallorca | |
| Balma de ses Porrasses | Endins | Mallorca | |
| Balma de S'Olivella | Endins | Mallorca | |
| Balma del Cami de la Male | Endins | Mallorca | |
| Balma des Mussol | Endins | Mallorca | |
| Balma des pa Porci | Endins | Mallorca | |
| Balma Rotera | Endins | Mallorca | |
| Ban Chom Ong System | D | Loas | |
| Bandijerna | Regards | ||
| Ban Dong-Xinu-Chu Yan Dong System | CC | China | |
| Bank Holiday Hole | RRCPC | Leck Fell | |
| Banwell Livvy | MCG | ||
| Ban-Y-Gor Cave | D | Forest of Dean | |
| Bar Pot | CRG-P, LUSS, CPC | Ingleborough | |
| Bar Pot (Wades entrance) | LUSS | Ingleborough | |
| Bara-Bahau | BC | ||
| Barachegagnako Harpia | CUCC | French Pyrenees | |
| Barbon Pot | GC | ||
| Barengassewindshacht | BEC, CC, NCC | Austria | |
| Barenschacht | B237, Stalactite | Switzerland | |
| Bargh Rift | MCG | Devon | |
| Bargh's Cave and Pot | LUSS, SS | Chapel-le-dale | |
| Barkin Mad Cave | RRCPC | ||
| Barnes Pit | CANC | Canada | |
| Bat Cave | CANC | Canada | |
| Bat Hole | BEC, CSS | Wiltshire | |
| Batasuna Zuloa | Espeleologiako Eusko Batzordea | ||
| Bath Swallet | D | Mendip | |
| Batman Hohle | BC | Austria | |
| Battery on the Head | RRCPC | Barbondale | |
| Battery Swallet | D | ||
| Batty Cave | GSG, SS | Kingsdale | |
| Batty Green Cave | GC | Ribblehead | |
| Batu Caves | RRCPC, CSS, B676, BCRA-T | Malaysia | |
| Beachy Head Cave | CSS, D, CC | Sussex | |
| Bean Pot | WRPC, BRPC | Storrs Common | |
| Beards Blue Hole | CANC | USA | |
| Beauty Cave | CANC | Canada | |
| Beck Head Stream Cave | CDG | Witherslack | |
| Beck Head Stream Cave | CDG | Yorkshire | |
| Beckermonds Pots | NPC | Wharfedale | |
| Beech Tree Swallet | ISCA | Gloustershire | |
| Beer Sea Caves | WP | Devon | |
| Beinn An Dubhaich Cave | MSG, BCRA-J | ||
| Belfry Pot | CPC | Pyrenees | |
| Bellam Cave | WP | India | |
| Bem Tem | BCRA-T | New Guinea | |
| Ben Donich (cave on) | GSG | Argyll | |
| Benscar Cave | YSS | Settle | |
| Bergerhohle | B237 | Austria | |
| Berloga | B332 | Uzbekistan | |
| Berry's Sink Hole | BCRA-T | Jamaica | |
| Betula Cave | GSG | ||
| Betzula Resurgence Cave | CUCC | ||
| Betzulako Harpia | CUCC | Pyrenees | |
| Bewley Caves | IS | Co. Waterford | |
| Bewley West Caves | IS | Co. Waterford | |
| Bibima Cave | CPC | ||
| Big Door Cave | MU | New Mexico | |
| Big Meanie | MUSS, BCRA-T | ||
| Big Sink Cave | D | Forest of Dean | |
| Bilberry Pot | RRCPC | ||
| Birkhill Fireclay Mine | GSG | ||
| Birks Fell Cave | SS, CPC | ||
| Birks Wood Cave | NCC, CPC, CDG, CUCC | ||
| Birkwith area | BPC | ||
| Birkwith Cave | WRPC | ||
| Birthday Hole | CSS | Bector Wood Quarry | |
| Birthday Hole | GSG | Assynt | |
| Bishops Wood Cave | BC | S. Wales | |
| Bishopston Sink No. 3 | BC | S. Wales | |
| Bjorneskallegrotten | CRG-T | ||
| Bjuraagrottene | GC | Arctic Norway | |
| Black Burn Cave | IS | Co. Kerry | |
| Black Cavern | CWM, ISCA | S. Wales | |
| Black Crow Pot | MUSS | N. Spain | |
| Black Dub Caves | KCC | ||
| Black Hole Cave | CANC | Canada | |
| Black Keld | CUCC, WRPC, D, BSA-CS, CDG | Wharfedale | |
| Black Morfa Mine | D | ||
| Black Reef Cave | BSA-CS | ||
| Black Rift 1 - 4 | GSG | Argyll | |
| Black Rising | BRPC | Ingleton | |
| Black Rock Quarry, Caves of | CWM | S. Wales | |
| Black Sheep Sink | WRPC | Langstrothdale | |
| Black Shiver Pot | LUUSS, LUSS, D, | ||
| Black Sliver Pot | RRCPC | ||
| Blackbird Hole | CI | New Zealand | |
| Blackmoor Swallet | MCC | Mendip | |
| Blackrock Quarry & Caves | CSS, ISCA | Wales | |
| Blacksmith's Cave (Uamh An Gobha) | GSG | Applecross | |
| Blaen Hepste Resergence | CDG | S. Wales | |
| Blaen Onneu Quarry Caves | D | ||
| Blaen-y-Nant Mine | GCC | Wales | |
| Blafjellgroth | CPC | South Nordland | |
| Blafjellgrotta | BCRA-CP | Norway | |
| Blair Nam Fiadhug Pot | GSG | ||
| Bleakley Pot | SS | New Zealand | |
| Bleaklow Quarry Cave | CC | Derbyshire | |
| Bleaklow Slutch Cave | CC | Dearbyshire | |
| Blind Gill Hole | MSG | ||
| Blind Gill Level | MSG | ||
| Blind Pot Series | SS | ||
| Blishmire House Cave | MUSS | ||
| Blitzwasserschacht | CI | Austria | |
| Blocky Cave | IS | Co. Kerry | |
| Blood Windypit | MSG, BCRA-T | ||
| Blue John Caverns | EPC, TSG, SS, B764 | Derbyshire | |
| Bluebell Cave | CANC | Canada | |
| Bluebell Wood Cave | MSG | ||
| Bluewater Cave | CANC | Canada | |
| Boat House | MSG | ||
| Boca del rio Apetlanca | AMCS | Mexico | |
| Bogalove-Gouvi | EPC, TSG, SS | Papua New Guinea | |
| Bogg Hall Cave | CC, D | Kirkbymoorside | |
| Boggarts Roaring Holes | D, RRCPC | Ingleborough | |
| Boghole | BCRA-S | N. Spain | |
| Bohemia Cave | IC | New Zealand | |
| Boho Cave | WSG | Co. Fermanagh | |
| Boltby Quarry Caves | BCRA-B | Cleveland | |
| Bomb Pot | BCRA-T | Canada | |
| Bone Cave | CSS | Co. Clare | |
| Bone Caves | GSG | Assynt | |
| Bone Hole | MCC | Mendip | |
| Boom Pot | GSG | Schichallion | |
| Boreham Cave | KCC, CPC, SS | Littondale | |
| Borehole, The | CRG-T, D, MSG,LS, BSA-CS, B125, RRCPC | Casterton Fell | |
| Borrins Moor Cave | ULSA, SS | ||
| Bosson Hole | SUSS | ||
| Bottlehead Slocker | D | Somerset | |
| Bottle Pot | D | Derbyshire | |
| Bou Bulok | B332 | Uzbekistan | |
| Boulder Cave | RRCPC | ||
| Boulder Pot | RRCPC | Leck Fell | |
| Boulder Pot | CSS | Norway | |
| Boulderosa | LUSS, BCRA-T | N. Spain | |
| Boundary Pot | LS, RRCPC | Easegill | |
| Boundary Slit | BSA-J | ||
| Bouther Gill Cave | CPC | ||
| Bowden Hill Mine | GSG | West Lothian | |
| Bowery Courner Swallet | BEC | ||
| Bowling Alley Cave (Kugelgartenhohle) | BSA-CS | Austria | |
| Box Freestone Mine | SS | ||
| Boxhead Pot | CC | Leck Fell | |
| Bracken Cave | CPC | ||
| Brackenbottom Pot | BPC, CC | ||
| Brackenthwaite Cave | SS | ||
| Bradshaw Resurgence Cave | D | Derbyshire | |
| Bradwell Moor Shafts | SUSS | ||
| Bradwell Parish Cave | BSA-CS | ||
| Brail Cave | SS | ||
| Branches Cave | BCRA-T | Norway | |
| Brandloch | Stalactite | Switzerland | |
| Bransgill Cave | NPC, NRCG, BPC | Penyghent | |
| Branwell Caves | BEC | ||
| Brasgyll Caves | MSG | Clwydd | |
| Brauninghohle | CUCC | Austria | |
| Breakish Cave | GSG | Skye | |
| Brendon Hills Iron Mines | CSS | ||
| Brezno Pri Leski | BPC | Yugoslavia | |
| Bridge Cave | BC, WSG, CDG | S. Wales | |
| Bridgeend Area, Caves of | CWM | Bridgend | |
| Brightgate Cave | BCRA-T, B479 | Derbyshire | |
| Brindles Rift | GSG | Applecross | |
| Brixham Cave | BEC | ||
| Brockham Hearthstone Mine | CROY | ||
| Broken Finger Pot | LUSS, NCC, CC, SS | ||
| Bronte Cave | CC | Casterton | |
| Broomfield Quarry Cave | BC | ||
| Brothers Cave | MSG | Co. Waterford | |
| Brown Hill Pot | CC, NCC, OUCC | E. Kingsdale | |
| Browne's Hole | WCC | Mendip | |
| Brownley Hill Mine | SS | ||
| Bruffeys Creek Cave | CANC | USA | |
| Bruffeys Creek Cave | CANC | Canada | |
| Bruneckerhohle | BSA-CS | ||
| Brunskill Hole | NPC | Leck Fell | |
| Brunt Mine | SUSS | Bradwell | |
| Brusegrotta | CC | Norway | |
| BU56 | D, CI, BC | Naverna Spain | |
| Buca della Condotta | Speleologica | Italy | |
| Buca Gofredo (TLU-685) | Speleologica | Italy | |
| Buca Nuova | Speleologica | Italy | |
| Buch di Monte Pelato | B237 | Italy | |
| Bucket on the Head | RRCPC | Barbndale | |
| Buckfastleigh Caverns | BSA-CS | Devon | |
| Buckhaven Gasworks Cav | GSG | Fife | |
| Bucklands Windypit | BCRA-T | N. Yorks | |
| Bulgarian Caves | BSA-CS | ||
| Bull Pit | B584 | Derbyshire | |
| Bull Pot | BCC | Kingsdale | |
| Bull Pot of the Witches | BEC, CRG-T, CSS, RRCPC, OUCC, BSA-J, LS | Casterton Fell | |
| Bull's Hole Cave | SUI | Co. Tipperary | |
| Bumperhullet | CPC, SS | ||
| Bunderitza Pot | SUSS | Bulgaria | |
| Bunkers Hole | BSA-CS | ||
| Bunnadubher Cave | CSS | Co. Mayo | |
| Bunton Hush Cave | MSG | ||
| Burr Cave | CSS | New Zealand | |
| Bus de la Genziana | B237 | Italy | |
| Butchers Rake Level | CPC | Wharfedale | |
| Butterfly, cave of the (Kelebekli) | RRCPC | Turkey | |
| Buttertubs, The | MSG, B716 | Swaledale | |
| Bwlch Creolen Deep Level | GCC | N.Wales | |
| Bye George Pot | CC, RRCPC | Leck Fell | |
| C.G. Caves 25-27 | BCRA-T | ||
| C3-1 Shui Lian Dong - Water Curtain Cave | Hong Meigui | China | |
| Cacouetta Canyon, Caves of the | BSA-CS | France | |
| Cadeby Pot | YSS | S. Yorkshire | |
| Cadomin Cave | CANC | Canada | |
| Cady's Level | GCC | N.Wales | |
| Cahermaan | CPC | ||
| Caine Hill Shaft | D | Priddy | |
| Calamine Pit (Dinkling Green Mine Cave | BC | Lancashire | |
| Calaven de la Seoubio | CDG | France | |
| Calcite Caves | BSA | ||
| Caldbergh Gill Cave | YURT | Coverdale | |
| Cale Mar | BCRA-T | Iran | |
| Calesdale Caver, Lower | DCA | Derbyshire | |
| Calf Holes | NRCG, LS | Birkwith | |
| Calgardup Cave | WSG | W. Australia | |
| California Caverns | WSG | America | |
| Callaun 1-5 | B206 | Co. Clare | |
| Cambrian Slate Mine | CDG | N. Wales | |
| Camp III Hole | BCRA | New Guinea | |
| Camus Malag Cave | BCRA-T, MSG, SUSS | Skye | |
| Canadian Hole | CC | Canada | |
| Canary Pot | RRCPC | Ingleborough | |
| Candlestick Cave | CANC | Canada | |
| Cango Cave | CPC, BSA-CS | South Africa | |
| Cannahowna River Cave | CSS, CC | Co. Galway | |
| Canyon Creek Ice Cave | CANC | Canada | |
| Cappagh Cave | IS | Co. Waterford | |
| Cappy Gill Caves | WRPC | ||
| Car Pot | LUSS,LUCC,CPC,ULSA,WSG | Yorkshire | |
| Car Pot Passage | B584 | Derbyshire | |
| Careg Llwyd Cave | B222 | Carmarthen | |
| Carl Braseeths Grotta | CRG-T | ||
| Carlsbad Caverns | LUSS, B681 | USA | |
| Carlswark Cavern | SUSS, BSA-CS, CDG, BCRA-T, EPC, LS, TSG, | ||
| Carnivore Cave | GSG | Skye | |
| Carno Adit Cave | CSS, D, CC, LS, OUCC | S.Wales | |
| Carraigtoughil | BEC | Co. Cork | |
| Carreg Castle Cave | ISCA | ||
| Carrigmurrish Cave | IS | Co. Waterford | |
| Carrowmoor Cave | SP(D&N) | Ireland | |
| Carsico del Monte Corchia | Speleologica | ||
| Cartilage Cave | BPC | Newby Moss | |
| Cascades Resurgence Cave | IS | Ireland | |
| Castell de Sant elip | Endins | Mallorca | |
| Casterton Fell | LS | Casterton Fell | |
| Casterton Pot | SP, OUCC, RRCPC, | Casterton Fell | |
| Castle Farm Dig | BEC | ||
| Castleguard Cave | CANC, BCRA-B | Canada | |
| Castleton | BSA-CS | Derbyshire | |
| Cat Holes | SP(D&N) | Clapham | |
| Catamite Hole | CC | E. Kingsdale | |
| Cater Magara | IC | Syria | |
| Cathedral Cave | BC, ISCA | Dyfed | |
| Catherine Cave (Katerinska Jeskyne) | CSS | Czechoslovakia | |
| Cattle Grid Pot | MSG | Gretadale | |
| Causse de Viols le Fort | SCAL | France | |
| Cave of Queens | GSG | Kishorn | |
| Cave of the Skulls | MU | S. Wales | |
| Cave of the Snow | CRG-P | ||
| Cave of the Wild Horses | CSS, B205, D | Co. Clare | |
| Cave of the Winds (Lubang Angin) | |||
| Cave River Cave | CI | Arkansas USA | |
| Cavedale Pipe | BCRA-B | Castleton | |
| Cavern de Moestroff | Regards | Luxembourg | |
| Caverna Corredores | NSS | Costa Rica | |
| Cavities des Gorges de Covatannaz | Stalactite | Switzerland | |
| Cayaso Cave | E | Philipines | |
| Cefn Cave | KCC, BCRA-B, B663 | NE Wales | |
| Cefn y Ogof | GCC | Wales | |
| Ceiriog Cave lower | B663 | NE Wales | |
| Cerovac Caves | B718 | Yugoslavia | |
| Cerrada de la Magdalena | Espeleo Sie | Spain | |
| Cerrada del Tunal | Espeleo Sie | Spain | |
| Cetatile Povorlui | WSG | Romania | |
| Ceuve de los Jares | BUSS | Spain | |
| Chamber Pot | BCRA-T | Venezuela | |
| Chamber Pot (Poll Seomar) | D, GSG | Argyll | |
| Chamber Pot, The | GSG, | Argyll | |
| Chamber Pot, The | CANC | Canada | |
| Chanterelle Pot | MUSS, CC | Ingleborough | |
| Chantoir du Rouge Their | CSS | Belguim | |
| Chantoire des Pins | Regards | Belguim | |
| Chantoire du Fond de Rostene | Regards | Belguim | |
| Chaou Marti | BEC | ||
| Chapel Lodge Cave | WRPC | Wharfedale | |
| Chapel Wood Jet Mine | MSG | Arncliffe | |
| Charterhouse Cave | CC, MCG, D | Mendip | |
| Chatham Defences | CSS | ||
| Cheddar Gorge | LS | Mendip | |
| Chen Ulish | CANC | Mexico | |
| Chen-Ven-Sil-Mut | CANC | Mexico | |
| Cherry Tree Hole | CPC, LS, | ||
| Chert Cave | NPC | Wild Boar Fell | |
| Chert Rift Cave | GSG, Dorset | ||
| Chester Sike Cave | MSG | ||
| Chiang Dao Cave | SWCC | Thailand | |
| Chilmark Stone Mine | BEC | S. Wiltshire | |
| Chilton Farmhouse Tunnel | WP | Kent | |
| Chiquibul System | NSS | Guatemala | |
| Choked Cave | GSG | Kishorn | |
| Chomping Digger Hole | CSS | Maesbury | |
| Chourun Camarguier | RRCPC | ||
| Chourun de la Parza | LS, RRCPC | ||
| Chourun des Aiguilles | D, BPC, WSG, EPC, B236 | France | |
| Christmas Hole | BEC | ||
| Christmas Pot | BPC, SWCC | ||
| Christmas Swallet | D, DCA, CC | Derbyshire | |
| Chrome Hill Swallet | OCC | Derbyshire | |
| Chuan Yan | China Caves | China | |
| Chudleigh Cave | CSS | ||
| Chungo Cave | CANC | Canada | |
| Church Hole | MSG, | ||
| Churns, The | D, RRCPC | Barbon High Fell | |
| Cigalere | E, CPC, EPC | France | |
| Cilcain Cave (Nant Gain Cave) | B663 | NE Wales | |
| Clachtoll Sea Caves | RRCPC, LS | ||
| Claig-Ionn | GSG | Appin | |
| Claire, Caves of Co. | CPC,D | Ireland | |
| Claisfer Resurgence | CSS, CWM | ||
| Claon Uamh | MSG, BCRA-T, GSG | Appin | |
| Cloanaite Seven | GSG | Scotland | |
| Clapham Beck Head Cave | LUSS, CDG | Yorkshire | |
| Clapham Bottoms Pot | BPC, WRPC, | Yorkshire | |
| Clapham Cave (see Ingleborough Cave) | Yorkshire | ||
| Clargillside Caves, Upper & Lower | MSG | Alston | |
| Clark's Cave | Falls 1987 | Virginia, USA | |
| Clearmidge Hole | GSG | Argyll | |
| Clearwater Cave (Gua Air Jernih)Batu Paku | CC | Mulu | |
| Cledy Cave | MSG | Ireland | |
| Cleft Cave | CANC | Canada | |
| Cliff Cave | RRCPC | Easegill | |
| Cliff Beck Head | MSG, B716 | ||
| Cliff Force Cave | MSG, CPC | Swaledale | |
| Clochnant | GCC | N.Wales | |
| Clod Dike | NPC | ||
| Clos de La Matota | Endins | Mallorca | |
| Clougher Cave | IS | Co. Kerry | |
| Cloughermore Cave | CC, IS | Co. Kerry | |
| Cnoc Na Creige Cave | GSG | Kishorn | |
| Cnoc Nan Uamh Cave System | CRG-T, GSG, CDG | Sutherland | |
| Coal Hole, a way into Short Drop | SUSS, BCRA-T | Leck Fell | |
| Coal Pit Hole | BSA-J | ||
| Coaly Rift Cave | ISCA | Uley | |
| Cobble Rising Cave | CDG | Bruntscar | |
| Cochol | CANC | Mexico | |
| Cockhill Smelt Mills | BSA-CS | ||
| Cocklebiddy Cave | CI | Australia | |
| Coed Du Shaft | GCC | N.Wales | |
| Coille Gaireallach | GSG | Skye | |
| Coldwater Cave | CI | America | |
| Coldwater Cave | GSG, OCC | Scotland | |
| Colley Hill | CSS | Surrey | |
| Colliers Peril | SP(D&N) | ||
| Colosuss | BCRA-S | Crete | |
| Comme Ferret | BEC | ||
| Conch Sound Blue Hole 1 & 2 | BCRA-T | Andros | |
| Condor Cave | BC | Columbia | |
| Condyle Cave | GSG | Skye | |
| Confluence Cave | MSG | Ireland | |
| Cong Risings | CDG | Galway | |
| Conies Dale pot | CRG-N | ||
| Connection Cave | YSS | Connisborough | |
| Conning Tower Cave | CSS | ||
| Contenda Cave | CRG-T | Portugal | |
| Cook's Wood Hole | CRG-N | ||
| Coolagh River Cave | B236 | ||
| Coolanau (Ooanagoloor) | MSG, D, IS | Co. Waterford | |
| Coole Cave | D, CSS, CDG | Co. Clare | |
| Coolgarden Caves 1-4 | BSA-CS | ||
| Cooper's Hole | BEC | Cheddar | |
| Coppice Cave | CPC | ||
| Coriolis Chasm | CI | New Zealand | |
| Corkey's Pot (GG) | D, BPC | Ingleborough | |
| Corner Sink | RRCPC | Easegill | |
| Coronation Pot | NPC | Fountains Fell | |
| Corporation Woods iron Mine | BEC | ||
| Cosh Beck Cave | MUSS | Foxup | |
| Cosh Beck Head Caves | YURT | Foxup | |
| Cosh House Cave | MUSS | Foxup | |
| Cote Gill Pot | LS, LUSS | Littondale | |
| Cotozozia | E | N.W. Spain | |
| Cotterdale House Cave | MSG | Wensleydale | |
| Cotterside Cave | MSG | Wensleydale | |
| Cova Amagada | Endins | Mallorca | |
| Cova Artificial | Endins | Mallorca | |
| Cova Baixa | Endins | Mallorca | |
| Cova de les Rodes | YSS | Mallorca | |
| Cova de los Estudiants | CDG | Mallorca | |
| Cova de N'Esteve | Endins | Mallorca | |
| Cova de Na Megare | Endins | Mallorca | |
| Cova de na Rafalera | Endins | Mallorca | |
| Cova de sa Balma | Endins | Mallorca | |
| Cova de sa Garlanda | Endins | Mallorca | |
| Cova de sa Gleda | Endins | Mallorca | |
| Cova de sa Palla | Endins | Mallorca | |
| Cova de sa Paret | Endins | Mallorca | |
| Cova de S'Aigo | Endins | Mallorca | |
| Cova de S'Abisament | Endins | Mallorca | |
| Cova de Sant Canut | Endins | Mallorca | |
| Cova de sa Gleda | CDG, Endins | Mallorca | |
| Cova de sa Tauleta | Endins | Mallorca | |
| Cova de ses Cabres | Endins | Mallorca | |
| Cova de S'Escar | Endins | Mallorca | |
| Cova de S'Onix | Endins | Mallorca | |
| Cova de S'Onix | Endins | Mallorca | |
| Cova del cal Pesso | YSS | Mallorca | |
| Cova dels Aleixandris | Endins | Mallorca | |
| Cova des Arcs | Endins | Mallorca | |
| Cova des Blocs | Endins | Mallorca | |
| Cova des Boc | Endins | Mallorca | |
| Cova des Caramells | Endins | Mallorca | |
| Cova des Corral d'en Ferrer | Endins | Mallorca | |
| Cova des Fonoll Mari | Endins | Mallorca | |
| Cova des Fumassos | Endins | Mallorca | |
| Cova des Marmol | Endins | Mallorca | |
| Cova des Pas de Vallgornera | Endins | Mallorca | |
| Cova des Pedris | Endins | Mallorca | |
| Cova des Romani | Endins | Mallorca | |
| Cova Nova | Endins | Mallorca | |
| Cova Sa Campana | NPC | Mallorca | |
| Cova Triangular | Espeleo Sie | Spain | |
| Coval de L'era | Endins | Mallorca | |
| Coval del Ratoli | Endins | Mallorca | |
| Covalet dels Orats | Endins | Mallorca | |
| Cove Hole | GC | ||
| Coveta de A'Illot | Endins | Mallorca | |
| Coveta des Coco | Endins | Mallorca | |
| Coving Sike Pot | MSG | Teesdale | |
| Cow Close Pot | NCC | ||
| Cow Garth Cave | BPC | Langstrathdale | |
| Cow Hole | BSA-CS | ||
| Cow Hole | CSS | S. Africa | |
| Cow Pot | KCC, RRCPC | Casterton Fell | |
| Cowarch Lead Mine | GCC | Wales | |
| Cox's Cave | B153, B023, CPC | Cheddar | |
| Crackpot Cave | B125, NPC, LS | ||
| Craftsman's Pot | NCC, LS | West Kingsdale | |
| Crag Cave | CC, D, CSS, IS | Co. Kerry | |
| Crag Quarry Cave | IS | Co. Kerry | |
| Cragfoot Mine | B253, LCMRS, NMRS | Lancashire | |
| Craig - a - Ffynnon | CSS | ||
| Craig Ddu | GCC | N.Wales | |
| Craiog-y-Mwyn | GCC | N.Wales | |
| Cramp Pot | ULSA | Birkwith | |
| Crawleyside Cave | MSG | Stanhope | |
| Creag Nan Uamh Bone Caves | CRG-T | Sutherland | |
| Creaking Death Pot | GSG | West Kingsdale | |
| Creevy Cave | D, BCRA-S | Ireland | |
| Crescent Pot | SP(D&N), LUSS, LS | ||
| Crete | BC | Crete | |
| Crimbo Swallet | SUSS | ||
| Cripple Creek (Ireby Fell Cavern) | D | Leck Fell | |
| Crock Pot (Waterfall Swallet) | DCA | Derbyshire | |
| Crocodile Cavern (Canyon) | Dorset | ||
| Cross Joints Swallet | CC, SUSS | Forest of Dean | |
| Cross Pot | WRPC, MSG | ||
| Cross River Spring | CANC | Canada | |
| Crotty's Cave | IS | Co. Waterford | |
| Crowsnest Spring | CANC | Canada | |
| Cruckle Pot | MSG | ||
| Crwbin Cave | B222 | Carmarthen | |
| Crystal Beck Cave | WRPC | Littondale | |
| Crystal Cave | CANC | Bermuda | |
| Crystal Cave | GC, WRPC | Barbondale | |
| Crystal Cave (Grotte de Cristal) | B583 | Svalbard | |
| Cubio Collada | BCRA-S | N. Spain | |
| Cubio de la Gatuna | BCRA-S | N. Spain | |
| Cubio de la Renada | MUSS, BCRA-T, MUSS, E | ||
| CUCC 3-7b | CUCC | French Pyrenees | |
| Cuckmere Haven Sea Caves | CSS | Sussex | |
| Cuddy Gill Cave | LS | Ribblehead | |
| Cueva de Churro (Cueva Elegante) | MUSS | N. Spain | |
| Cueva A Sul | CRG-T | ||
| Cueva Blanch | RUCC | N. Spain | |
| Cueva Buchaquera | B236 | Spain | |
| Cueva C29 | LUSS | N. Spain | |
| Cueva Campamento | WSG | Cuba | |
| Cueva Campana | OUCC | Spain | |
| Cueva Casas de Piedra | BCRA-T | Venezuela | |
| Cueva Cerro de Las Minas | WSG | Spain | |
| Cueva Chica | AMCS | Mexico | |
| Cueva Ciquitica | WSG | Cuba | |
| Cueva Collada | E, BCRA-S | N. Spain | |
| Cueva Collada | BCRA-S | Spain | |
| Cueva Culiembro | NPC, OUCC | N. Spain | |
| Cueva de Agua | LUSS | N. Spain | |
| Cueva de Agua Carlota | CANC | Mexico | |
| Cueva de Agua Escondida | CANC | Guatemala | |
| Cueva de Aguacero | CANC | Mexico | |
| Cueva de Alpazat | IC, D | Mexico | |
| Cueva de Arena | RUCC | N. Spain | |
| Cueva de Asta | BUSS | Spain | |
| Cueva de Basura | MUSS | N. Spain | |
| Cueva de Bolugo | CRG-T, OUCC | ||
| Cueva de Calduenin | CRG-T | ||
| Cueva de Callan Rouiera | CRG-T | ||
| Cueva de Camburales | CRG-T | Venezuela | |
| Cueva de Carcaveuszo | MUSS | ||
| Cueva de Chenalho | CANC | Mexico | |
| Cueva de Churuguara | BCRA-T | Venezuela | |
| Cueva de Cinco Abril | E | Mexico | |
| Cueva de Cobrantes | MUSS | N. Spain | |
| Cueva de Comediante | E | N. Spain | |
| Cueva de Conjtina | BCRA-T | N. Spain | |
| Cueva de Cotoril | RUCC | N. Spain | |
| Cueva de Cuchillo | AMCS | Mexico | |
| Cueva Culiembro | CDG | Spain | |
| Cueva de Cul Huehuetenango | CANC | Guatemala | |
| Cueva de Diamante | B236 | ||
| Cueva de Domingo Lopez | BCRA-SA | N Spain | |
| Cueva de Entrago | E | N.W. Spain | |
| Cueva de Entrambascuetos | E | N. Spain | |
| Cueva de Entre Cuetos | E | N. Spain | |
| Cueva de Erizo (Hedgehog) | E | Mexico | |
| Cueva de Fair Share | BUSS | ||
| Cueva de Huagapo, La | BSA-CS, LS | Peru | |
| Cueva de Huerto Rey | BCRA-S | Spain | |
| Cueva de Iseca Nueva | OUCC | ||
| Cueva de Ixtacapa | CC, E | Mexico | |
| Cueva de la Abeja | BCRA-T | Venezuela | |
| Cueva de la Camino | RUCC | N. Spain | |
| Cueva de la Capellania | CANC | Guatemala | |
| Cueva de la Chorreadero | CANC | Mexico | |
| Cueva de la Disolucion (Dissolution Cave) | OUCC | S. Spain | |
| Cueva de la Joya del Zacate | SI | Italy | |
| Cueva de la Laguna Verde | CANC | Mexico | |
| Cueva de la Madama | BCRA-T | Venezuela | |
| Cueva de la Marniosa | LUSS, E, BPC, BCRA-T, WRPC | N. Spain | |
| Cueva de la Pena Colorada | D, ISCA | Mexico | |
| Cueva de la Penes | OUCC | ||
| Cueva de la Penill | OUCC | ||
| Cueva de la Penilla | OUCC | N. Spain | |
| Cueva de la Rata | BCRA-T | Venezuela | |
| Cueva de la Resplenda | LUSS, BCRA-T | N. Spain | |
| Cueva de la Ressurecion | WSG | Cuba | |
| Cueva de la Roco Naranja | OUCC | Spain | |
| Cueva de la Sala | AMCS | Mexico | |
| Cueva de la Silleta | AMCS | Mexico | |
| Cueva de la Uzueka | MUSS, E, BCRA-T | ||
| Cueva de la Virgen | OUC | ||
| Cueva de Ladera | SUSS | Spain | |
| Cueva de Lara-Lennon | MUSS | N. Spain | |
| Cueva de las Ketchup | SI | Italy | |
| Cueva de las Penitas | AMCS | Mexico | |
| Cueva de las Tinajas | AMCS | Mexico | |
| Cueva de las Tres Cruces | CANC | Mexico | |
| Cueva de Lechuzas | BSA-CS | ||
| Cueva de Liordes | BEC | ||
| Cueva de los Chivos | Speleologica | Chile | |
| Cueva de Los Dos Hermanos | WSG | Cuba | |
| Cueva de Los Hornos | E | Mexico | |
| Cueva de Los Pajaros | AMCS | Mexico | |
| Cueva de Los Pajaros | CANC | Guatemala | |
| Cueva de Los Quatros Vientos | BCRA-T | Venezuela | |
| Cueva de los Sabinos | CANC | Mexico | |
| Cueva de Los Tayos | BCRA-B, CPC | Ecuador | |
| Cueva de Los Tiestos O Mur Cielagis | CRG-N, GSG | ||
| Cueva de los Tres Amigos | WSG | Cuba | |
| Cueva de los Tres Rios | Speleologica | Chile | |
| Cueva de Macuquita | BCRA-T | Venezuela | |
| Cueva de Mata Patla | BSA-CS | ||
| Cueva de Mildon | RUCC | N. Spain | |
| Cueva de Oceno | RUCC | N. Spain | |
| Cueva de Orandi | CRG-P | ||
| Cueva de Pacuy Huagen | CC | Peru | |
| Cueva de Puron | OUCC | N. Spain | |
| Cueva de San Agustin | CANC | Mexico | |
| Cueva de San Lorenzo | BCRA-T | Venezuela | |
| Cueva de San Marcos | BCRA-T | Tenerife | |
| Cueva de San Pablo | BCRA-T | Venezuela | |
| Cueva de Sangaza | CRG-T, OUCC | ||
| Cueva de Santa Cruz | CANC | Mexico | |
| Cueva de Tasalolpan | AMCS | Mexico | |
| Cueva de Taulabe | CANC | Honduras | |
| Cueva de Tinganon | OUCC, LS | N. Spain | |
| Cueva de Trinidad | BCRA-T | Venezuela | |
| Cueva de Valporquero | E | N.W. Spain | |
| Cueva de Viscaino | WSG | Cuba | |
| Cueva de Wueva | E | N.W. Spain | |
| Cueva de Xocotlat | AMCS | Mexico | |
| Cueva de Zarraga | BCRA-T | Venezuela | |
| Cueva del Agua | CRG-N, GSG, MUSS, CI, BCRA-T, CC, SWCC, LUSS, E, ISCA | ||
| Cueva del Burro | BCRA-T | Venezuela | |
| Cueva del Calor | Espeleo Sie | Spain | |
| Cueva del Camino | CANC | Mexico | |
| Cueva del Campanario | IC | Cuba | |
| Cueva del Chichicasapan | CI | Mexico | |
| Cueva del Coimbre | LUSS | ||
| Cueva del Dragon | Speleologica | Chile | |
| Cueva del Guarataro | BCRA-T | Venezuela | |
| Cueva del Humo | CRG-N | Puerto Rico | |
| Cueva del Humo | CC | N. Spain | |
| Cueva del Indio | CANC | Columbia | |
| Cueva del Mazo | MUSS | Spain | |
| Cueva del Molino | CC, CDG | Matienzo | |
| Cueva del Nido de Guacamayo | CC | Peru | |
| Cueva del Osu | OUCC, NPC, LS | N. Spain | |
| Cueva del Pajaro | BCRA-T | Venezuela | |
| Cueva del Piscarciano | LUSS | ||
| Cueva del Reefer Madness | CC, E, BPC | Mexico | |
| Cueva del Rio Chico | LUSS, E, BCRA-T | N. Spain | |
| Cueva del Tio Manolo | CDG | Spain | |
| Cueva del Torno | BCRA-S | Spain | |
| Cueva del Trueno | BCRA-T | Venezuela | |
| Cueva del Vapor | AMCS | Mexico | |
| Cueva del Viento | CRG-P, BCRA-T, OUCC | Tenerife | |
| Cueva del Zorro | E | Matienzo | |
| Cueva el Coy Coy de Uria | BCRA-T | Venezuela | |
| Cueva el Gueyo Reinazo | OUCC | N. Spain | |
| Cueva el Riito de Acarite | BCRA-T | Venezuela | |
| Cueva Elegante (Cueva de Churro) | MUSS | N. Spain | |
| Cueva Ensueno | NSS | Puerto Rico | |
| Cueva Escalera | E | Mexico | |
| Cueva Grande de Pan de Azucar | WSG | Cuba | |
| Cueva Grande de Puerto Hondo | IC | Mexico | |
| Cueva Hermosa del Cielo de Piedra | SI | Italy | |
| Cueva Huelga | E, OUCC | N.W. Spain | |
| Cueva Inclinada | AMCS | Mexico | |
| Cueva Jaiba | WSG | Cuba | |
| Cueva Jan Sanchez 1 & 2 | E | Mexico | |
| Cueva la Borbolla | OUCC | N. Spain | |
| Cueva la Boriza | OUCC | N. Spain | |
| Cueva Laneueru | CRG-T | ||
| Cueva Lechuza de Campanario | Speleologica | Chile | |
| Cueva Llueva | MUSS, BCRA-T, BCRA_S | N. Spain | |
| Cueva Misterio | NSS | Dominican Republic | |
| Cueva Mueria (Moria) | BCRA-T | N. Spain | |
| Cueva Negra | OUCC | N. Spain | |
| Cueva Robert TB1 | Regards | Mexico | |
| Cueva Riano | MUSS | ||
| Cueva Tang - Go - Jo | E, BPC | Mexico | |
| Cueva Tecolo | AMCS | Mexico | |
| Cueva Tepetzala | Regards | Mexico | |
| Cueva Titanic | WSG | Cuba | |
| Cueva Tito Bustillo | SWCC | N. Spain | |
| Cueva Trumbio | OUCC | N. Spain | |
| Cueva Valline | CC, CDG | Spain | |
| Cueva Vegalonga | SUCC, ULSA | Spain | |
| Cueva Yohualapa | E | Mexico | |
| Cuevas de Copudia | E | N. Spain | |
| Cuevas de Uchkupisjo | CC | Peru | |
| Cuevas dels Hams | Endins | Mallorca | |
| Cueve de Agua Caliente | AMCS | Mexico | |
| Cuir Ponor-Toplita de Rosia Cave System | WSG | Romania | |
| Culkein Caves | OCC | Sutherland | |
| Cullaun Cave series | BSA-CS, IS | Ireland | |
| Cumberland Cavern - Wapping Mine | Masson audit paper | Derbyshire | |
| Cundy Mole Cave | GSG | Stirlingshire | |
| Cup & Saucer Cave | BSA-CS | ||
| Cutlip Cave | CANC | Canada | |
| Cwmavon Quarry Cave | ISCA | Blaenavon | |
| Cwm Hew Bwub | WSG | ||
| Cwm Orog-Craig Rhiwarth Lead Mines | GCC | Wales | |
| Cwm Porth C Avens | BSA-P | ||
| Cwr Dwr II | D, SWCC | S. Wales | |
| Cyclone Cave | GSG | Skye | |
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