aSurvey Name Where to be found Additional Information
b libraryhome.htm book_num.htm
c clublist.htm survey_search.htm
Hackergill Caves KCC
Hagg Gill Pot LS, WRPC, CDG Langstrothdale
Hakonhullet CRG-T Norway
Hale Moss Cave LS Silverdale
Haliloch Stalactite Switzerland
Hallowe'en Rift BEC Mendip
Hallum Moss Cave ULSA
Halo Pot CC Ingleborough
Haltcliff Bridge Cave KCC Cumberland
Ham Wood Shelter MC Mendip
Hamarnesgrotten CRG-T Norway
Hammer Pot NPC, B684 Fountains Fell
Hamnsmolnelva Resurgence Cave CDG Norway
Hang Ban Lang Speleologica Vietnam
Hang Ba Loan Mondo Sotterraneo Vietnam
Hang Da Chow E Vietnam
Hang Duat IC Vietnam
Hang Duc Tien Mondo Sotterraneo Vietnam
Hang E (The Drain) E Vietnam
Hang En E Vietnam
Hang Kanh Xuan Speleologica Vietnam
Hang Khe Rhy IC Vietnam
Hang Nha Tro Mondo Sotterraneo Vietnam
Hang Over IC Vietnam
Hang Phong Nha E Vietnam
Hang Tien IC, E Vietnam
Hang Toi E Vietnam
Hang Vom IC, E Vietnam
Hangman's Hole LS, ULSA, D
Hangman's Wood (Deneholes) CSS
Hangover Hole DCA
Happelseeloch WSS Austria
Harbesska CSS Czechoslovakia
Hard Level Gill Cave MSG
Hardgill Pot (& Lower) see: Lower Hardgill Pot
Harehope Quarry Cave MSG
Harry Becca Mine DCA
Hartleycleugh Quarry Cave LS
Hartsop Hall Mine LS
Harwood Hole CSS, CPC New Zealand
Hauchhohle BCRA-CP Austria
Hause Waterfall Cave CANC USA
Hause Waterfall Cave CANC West Virginia
Hauzhu Yan System China Caves China
Haws Gill Wheel GC Chapel-le-dale
Haytime Hole KCC Horton in Ribblesdale
Hazel Bush Hill Hole MSG Bowes
Hazel Grove Caves RRCPC
Hazelbadge Cave BSA-CS
Heale Farm Cave BEC
Heaven Cave OUCC Thailand
Heidbanger Hole GSG, D Sutherland
Heifer's Outwash, Cave of the GSG Argyll
Hell Hole GSG
Hell Hole OUCC Botswana
Hellemofjord KCC Norway
Hellot Hole RRCPC, LS
Helm Gill Head Cave GC Whernside
Hendre Mines GCC N.Wales
Henne Morte LS
Henstock's Mine PDMHS Derbyshire
Henwood Pots (Gulley Holes) CPC
Hepse River Caves WSG
Herbert's Pot CI Tasmania
Herbet's Hole D Casterton Fell
Heretic's Cave GSG Kishorn
Herne Beck Cave (& Pot) MSG Wenseydale
Herne Hill Caves II & III (Gateways Cave) MSG, CC, DCA Maltby
Heron Corn Mill Cave RRCPC Beetham
Heron Pot LUSS, NPC
Hesleden Bergh Pot BPC
Hiberbian Cave GSG Glen Duror
Hiberbian Hole GSG Glen Duror
High Cave System YSS Connisborough
High Flow Cave BCRA-T Norway
High Fort Windypit BCRA-T N. Yorkshire
High Gill Caves NPC Dentdale
High Glasscnock Cave GSG Kishorn
High Hull Cave ULSA, LS
High Pasture Cave D, GSG, MSG Skye
High Rigg GC
High Roads Cave LCMRS
Higher Glasnock Cave GSG Kishorn
Higher Grassington Moor Lead Mines ULSA
Higher Ling Gill Pot NRCG
Highfields Mine OCC
Hijah Lubang (Green Cave) CI Sarawak
Hill Creek CANC USA
Hill Fort Windypit YSS Coverdale
Hills Creek Cave CANC Canada
Hirlatzhohle BCRA-S Austria
Hirlstz Cave BEC
Hoarthorns Wood Swallet SUSS Forest of Dean
Hochbrunnsulzenhohle SUSS Austria
Hochlecken Gross Hohle B236 Austria
Hodson's Shaft GCC Wales
Hole in the Road (St. Georges Cavern) MCG Mendip
Hole in the Wall, The SUSS Papua New Guinea
Holloch LS, WSG, BCRA-B, B236, CSS Switzerland
Hollow Cave CANC Canada
Hollow Mountain, The ICCC Slovenia
Hollowfield Swallet BEC
Holme Hill GC
Holwell Cavern CSS, MC Somerset
Holwell Combe Quarry Cave MC Mendip
Holywell Cave CRG-N
Hoo Valley Mine (North) MC Staffordshire
Hooksbank Mine WRPC Kettlewell
Horringger Court CSS
Horrocks Cross Cave MSG
Horse Level Cave MSG Faggergill
Horseshoe Cave YSS Settle
Hosse de las Garcas B236 France
How Gill Nick Pot CPC, WRPC Grassington Moor
Howden Lodge Sinks CUCC, WRPC Coverdale
Howes Cave CANC Canada
Howgill Sink RRCPC, D Casterton Fell
Hoya de la Conchas B236 Mexico
Hoya de la Luz CANC Mexico
Hoyo Del Sedo CC Mateinzo
Huautla System D, AMCS Mexico
Hufrah Misfah BCRA-T Oman
Huixtan Area, caves of CANC Mexico
Hull Pot B251, BCRA-B, LS
Hungerhill Swallet TSG Derbyshire
Hunter Lodge Inn Sink BEC
Hunters Hole BEC Mendip
Hunters Hole MSG Alston
Hunts Cave WSG Bahamas
Hurnel Moss Pot ULSA
Hurtle Pot BPC
Iaro River Cave CPC Papua New Guinea
Ibbeth Peril Caves KCC, SS, BSA-B, CC, D, B125 Cumbria
Ice Chest CANC Canada
Ice Hall CANC Canada
Ice Palace BCRA-CC
Ife Hole MC Mendip
Ifri N'Taouia CC Morocco
Ifton Quarry Caves BC Gwent
Igloo Pot CANC Canada
Ilam Rising DCA, CDG Manifold Valley
Ilgarini Magara LUSS N. Turkey
Inazumi Cave CDG Japan
Indio Cave BC Columbia
Ingleborough Cave (also known as Clapham Cave) CRG-P, BSA-CS, CDG, CPC,  BCRA-B, NPC, CC, B251, LS, WRPC, CDG N. Yorkshire
Ingresso Fornitori Tavola  Speleologica Italy
Iran GSG Iran
Ireby Fell Cavern NPC, NCC,SS, SUSS, NCC, CC, YSS, D Lancashire
Ireshopeburn Caves ULSA
Iris Cave GSG Scotland
Irish Caves B205 Ireland
Isaac's Cave SUSS Gloucestershire
Isetskaja B332 Uzbekistan
Isfjellelva B583, BC Spitsbergen
Isgrotten SWETC Norway
Island Ford Cave B263 USA
Isle of Wight, Caves of CSS Isle of Wight
Ivy Green Cave SUSS
Ivy Hole GSG
Iwata-Do CDG Japan
Jackdaw Cave OCC Manifold Valley
Jackpot Hole DCA, BSA-B, CDG, EPC, TSG Derbyshire
Jacks Scar Cave BSA-CS, MSG
Jacksons Bay Great Cave SP
Jacobs Well Cave MSG
Jacqueline Close Chalk Mine D, BSA-J, WP Bury St. Edmunds
Jagerbrunntrog System CC Austria
Jamaican Caves CANC Jamaica
Jamarska Sekcija Pd Tolmin ICCC Slovenia
James Hall's Over Engine Mine D, CC, DCA Castleton
Janus Pit Cave CI USA
Jarman Bottom Cave BSA-CS
Jaskini Czarnes WSG
Jaskini Marmurdwa CSS Poland
Jaskini Nad Kutlinami D
Jaskini Snieznej B236, D, WSG Poland
Jawbone Cave CANC Canada
JCB Hole D
Jeanie Barrie's Cave GSG Peeblesshire
Jed Pot WRPC
Jegerhullet BCRA-T Norway
Jemblongan ACA Java
Jeskynni Systemy Demanovska Doliny CSS Czechoslovakia
Jfre ou Drasse LUCC
Jfre ou Tagouileit LUCC
Jiangzhou Dongxuexitong BCRA-S, BCRA_T China
Jin Lun Dong China Caves China
Jingle Pot BPC Chapel-le-dale
Jingling Pot CC
Jingling Sike Cave MSG Hell Gill
JK Cave CC Co. Kerry
Jockey Hole YSS Allotment
Johara River Cave System BCRA-T Sarawak
Joint Hole BSA-B, D,CDG Chapel-le-dale
Joint Mitnor Cave CC, WP Devon
Joint-Mitnor Cave BSA-CS
Jonathan's Cave GSG Fife
Jordbrugrotten BSA-CS Norway
Joya Chen CANC Mexico
Joya Chen CANC Mexico
Jubilee Sink GC Ribblehead
Jug Holes BCRA-T, Masson audit, MCGCC Derbyshire
Jumandi Cave CC Ecuador
Juniper Gulf LUCC, NCC, LS, BPC, D N. Yorkshire
Kaakil Resergence System BCRA-T New Guinea
Kafatasi Magara (Skull Cave) LUSS N. Turkey
Kahaf VmalAlmanjum LUCC Oman
Kahf el Sahm el Azrax GSG
Kahf Ghbrat Tanuf BCRA-T Egypt
Kahf Hoti Cave System BCRA-T Oman
Kalkdalgrotta CSS Norway
Kammelu Grotten GC
Kanabu Wulang, lower BCRA-T Indonesia
Kaninchenhohle CC, CUCC Austria
Kapongwe Cave Wss Malawi
Karabayir Dudeni BCRA-T, SUSS Turkey
Karakisla Magara BCRA-T, SUSS Turkey
Karkarous Gardinitsa CC Greece
Katerinska Jeskyne (Catherine Cave) CSS Czechoslovakia
Kathy's Icebox D, CANC USA
Kathy's Icebox CANC Canada
Katnot Cave GC
Kaumana Cave BCRA-T Hawaii
Kava Kuna Stalactite Papua New Guinea
Kazumura Cave BCRA-T Hawaii
Keay Hole D, BPC Scoska Moor
Kef Anefid SUSS Morocco
Kef Arab SUSS Morocco
Kef Bere CC Morocco
Kef Chada CC Morocco
Kef Chedaya SUSS Morocco
Kef Djebal Chikker SUSS Morocco
Kef el Khars SUSS Morocco
Kef Khaffafh SUSS Morocco
Kef Kourdiat SUSS Morocco
Kef Lahnash (Snake Pot) CC Morocco
Kef Naverine SUSS Morocco
Kef O Izoura SOSS Morocco
Kef Rouadi CC Morocco
Kef Tammershelt SUSS Morocco
Kef Toghobeit B236 Morocco
Kef Zarour SUSS Morocco
Keld Bank Caves ULSA, LS
Keld Head CDG Kingsdale
Keldheads Cave MSG
Kelebekli (Cave of the Butterfly) RRCPC Turkey
Kenmare Cave CPC Killarny
Kents Cavern B063
Kerswell Cave BSA-CS
Kettleness Alum Mines MSG N. Yorkshire
Khazad-Dum CI Tasmania
Kievskaya B236 USSR
Kilbeg Bay Caves MSG Killarny
Kilchrist Cave MSG Skye
Kilgreany Caves IS Co. Waterford
Killi Cave E Papua New Guinea
Killuragh Cave IS Ireland
Kilmurry Cave IS Co. Kerry
Kiln Pot CPC Barbondale
Kinder Brioschi Speleologica Italy
King Pot HWCPC, SP(D&N), LUSS, CC, D, NCC, CSS, CDG Kingsdale
Kingsdale Head Cave RRCPC
Kingsdale Master Cave see: West Kinsdale Master Cave Yorkshire
Kirk Bank Cave LS, ULSA Upper Wharfedale
Kirk Bank Cave RRCPC Dentdale
Kirk Gill Pot CPC
Kirk Pot (Sputnik Pot) LS, LUCC, RRCPC, Easegill
Kirkdale Cave MSG
Kisdon Cave MSG
Kitchen Gill Valley Pot LUSS
Kittle Hill Caves BC S. Wales
Kittycross Cave BC
Kjorsvik Grotten CPC
Kloftgrotten KCC Norway
Knacker Trapper Pot NCC, LS Chapel-le-dale
Knock Fell Caverns GC, EN N. Pennines
Knocken Pot BSA-CS, GSG
Knotlow Caverns EPC, LS Derbyshire
Kolkblaser - Monsterhohle System IC Austria
Koona Koter D
Krem Mawmluh IC India
Krestik CC Caucasus West
Kristoffergrotten CRG-T
Kriznajama CPC, RRCPC
Krubera Cave (Voronja) CC Caucasus West
Krystallgrotten CRG-T, WSG Norway
Kudjal Yolgah WSG Australia
Kuhfladenschacht SUSS Austria
Kuling Hole SP, YSS
Kunga Cave CANC Canada
Kuroiwa-No-Yusen-No-Ana CDG Japan
Kuybyshevskaya BCRA-T Russia
Kuzan Bogazi Magara SUSS Turkey
Kvandalholn I & II KCC, CC, BCRA-T Norway
Kvisla Cave B583
La Boriza OUCC
La Borne aux Cassots CSS France
La Cavada MUSS N. Spain
La Coverona MUSS N. Spain
La Cueva de Coucha Louva BSA-CS
La Cueva de las Lechuzas MU  Peru
La Cueva de Puerta Pajar CANC Mexico
La Cuevhch MUSS N. Spain
La Cuvia de la Vega E N. Spain
La Cuvia de Seldesuto E N. Spain
La Font Maure D, CPC Pyrenees
La Grieta B236
La Grotte Casteret RRCPC, CSS Pyrenees
La Grotte de Guier Vif LS
La Grotte de la Merveilleuse a Dinant Regards Belguim
La Grotte du Docteur BSA-CS
La Pierre Saint-Matin (see: Pierre Saint-Matin)
La Preta BSA-CC
La Salida de Cruz Pilal CANC Mexico
La Sima de Callash Punta BCSA-CS
La Sima de Milpo CANC, LS Peru
La Sonnette CSS
La Systema de los Sabinos CANC Mexico
La Vega E, Matienzo N. Spain
La Verna BCRA-B
Labassas Speleologica Italy
Ladypark Wood Mine BSA-P
Ladyside Pot OCC, DCA
Lagarto Cave SWCC Ecuador
Laglingarten Cave GSG Argyll
Lai Baba BCRA-T Indonesia
Laichinger Tiefenhohle SP, WP Germany
Lamb's Leer BC, B014, LS, BCRA-T Somerset
Lamprechtsofen CC, CI, B286, BC Austria
Lancaster Hle - Dark side of the Grind D Casterton Fell
Lancaster Hole NPC, ULSA, D Casterton Fell
Lancaster Hole BSA-P, CRG, RRCPC, B, LS, MUSS, BCRA-B, CPC, CUCC, D Casterton Fell
Landlord Pot WRPC Langstrothdale
Langcliffe Pot ULSA, LS, CDG N. Yorkshire
Langgattwg Cave System, eastern zone LS
Langlang Tem BCRA-T New Guinea
Langsteinschacht B236 Austria
Langstroth Cave BPC, ULSA, SP, SUSS, CC Wharfedale
Lapiaz du Ger Regards France
Lapphullet CRG, LS, WSG Norway
Larch Tree Hole BPC
Large Pot NPC, CC, NCC, LS Leck Fell
Larshullet CRG, WSG Norway
Lascaux Cave CPC, WP, B677 France
Lassintullich Caves 1 to 5 GSG Schichallion
Lathgill Head Cave SUSS
Lathgill House Cavern BSA-CS Derbyshire
Lathkill Head Cave OCC, EPC, CC, TSG, LS
Lauknesfjellelgrotta CPC, LS
L'Aven d'Orgnac BPC France
L'Aven Grotte de Marzal BPC France
Layby Pot EPC Derbyshire
Le Buum Tem BCRA-T New Guinea
Le Grand Chourun Clot RRCPC
Le Grande Souci CDG France
Le Pot II CRG-N France
Lead Mine Moss  (area of) LS
Lease Rigg Whinstone Mine MSG E. Yorkshire
Leck Beck Head BSA-B, CDG Casterton Fell
Leck Fell Cave Systems, The LS, BCRA-T Leck Fell
Leck Fell Master Cave CRG Leck Fell
Ledbeg Cave GSG
Legacurragh Pot CPC
Leirskarel v Grotta GC Norway
Lemeregamas L85 Stalactite Papua New Guinea
Lemy River Flood Sink BSA-CS
Lergrotte BCRA-T
Les Perrats CANC France
Lesser Garth Caves BCRA-T, BC Cardiff, near
Lesser Kelcow Cave BSA-CS
LG3 Gargouff, ---  to LG10 Regards France
Liat Prah System BCRA-S India
Lille Gaulstadgrottene SWETC Norway
Lille Graataaga CRG-T Norway
Lime Kiln Rake GCC Wales
Limekiln Kiln Resergnce GSG Applecross
Limestone Caverns CANC Canada
Linchmere Common Tunnels CSS Sussex
Ling Gill Scar Cave NPC
Link Pot BEC, CSS, CI, CUCC, LS Leck Fell
Linley Limestone Mine CDG Derbyshire
Lionel's Hole BEC Burrington Coombe
Lisengrotta SP
Lismorahaun House Cave GSG Co. Clare
Little  Bull Pi B584 Derbyshire
Little Douk Cave ULSA
Little Edelweiss Shaft BSA-CS
Little Fell Pot WRPC Darnbrook
Little Gill Hole MSG
Little Hull Hole (Pot) LS, B251, LS Penyghent
Little Meregill Hole ULSA, CPC
Little Neath River Cave BEC, WSG, NMCC, CDG, CC, UBSS, LS, MC
Little Pot NCC Leck Fell
Little Rift CPC
Little Stream Cave  CANC Canada
Littlewood Cave MUSS Foxup
Liu Chi Aokou (Xia) Dong China Caves China
Liu Jia Wan Dong China Caves China
Liu Jiao Wan Dong China Caves China
Lizard Pot CPC
Llamigo Cave OUCC N. Spain
Llanelly Quarry Pot D, CC, CSS, LS
Llewellyn Glacier Cave CANC Canada
Lliwedd Copper Mine GCC Wales
Llygad LLwchwr Cave BC Wales
Llygod Llwechwr D, SWCC, CDG, B222, CSS
Llyn Ochin Pot B663 NE Wales
Lo Marge Endins Mallorca
Lo Ten China Caves China
Lobergsgrottan BC Sweden
Lock Hole Caves 1 & 2 GSG Schichallion
Lockey Gill Pot (Cave) BSA-J, BSA-B, MUSS, WSG
Locust Creek Cave CANC USA
Lodmore Hole BEC Yoxton
Lolly Scar Lead Mine ULSA, LS
Long Drop Cave GC, ULSA, CC, BCRA-T
Long Gour Cave (System) D, BRPC Storrs Common
Long Kin East Pot CRG-N, YSS
Long Kin West KCC
Long Scar Caves 1, 2 & 3 MSG Long Sleddale
Longgong Dong China Caves China
Longrake Founder Shaft D
Longstone Edge Mines LS Forest of Dean
Longtan Dong China Caves China
Longwood Swallet BSA-CS, B014, D, LS, MCG
Lookout Cave YSS
Lookout Rift Dorset
Loop Cave SUSS Yorkshire
Loophole MSG
Lords Hole BSA-B
Los Tayos CPC, GSG, RRCPC, YSS, LS Ecuador
Los Tres Ojos de Agua D Dominican Republic
Losers' Pot D, BPC Penyghent
Lost Caverns System BRPC Ingleton
Lost Johns CRG-T, LUCC, NCC, BCRA-T, CC, LS, KCC, WSG Leck Fell
Lost Nigel's Cave CPC Spain
Lost Pot NPC, BCRA-T, LS Leck Fell
Lost Richard Cave CANC Canada
Lost Waters, Cave of the WSG Norway
Lot Farm Shaft Cave GCC, B663 N. Wales
Lovergill East Cave MSG, CPC
Lovergill Sink Cave MSG, CPC
Lovstad Grotten CRG-T, CDG, SWETC Norway
Low Bottom Cave YSS Coverdale
Low Douk Cave NPC, SP, LS, SUSS, NCC Kingsdale
Low Hall Cave KCC Dentdale
Lower Arch Cave BRPC Ingleton
Lower Calesdale Cave SP(D&N), EPC
Lower Ceirog Cave SMCC N. Wales
Lower Cullaun Zero WRPC
Lower Easegill Cavern see: Pegleg Pot Leck Fell
Lower Flood Entrance MCC Mendip
Lower Hardgill Pot LS
Lower Lake Sink Cave BCRA-T Canada
Lower Ling Gill Cave WRPC
Lower Long Churn Cave ULSA, LS
Lower Otter Hole GSG
Lower Scar Hill Cave (& east) WRPC
Lower Traligill Cave CRG-T, GSG Sutherland
Loxton Cavern BEC, D, UBSS Mendip
Lubang Angin (Cave of the Winds) CI Sarawak
Ludwell Cave BEC, MC Somerset
Lukina Jama IC Croatia
Lumb Hole SP(D&N) Derbyshire
Lummelundagrottorna BC
Lunehea Mine (and Cavern) MSG
Lungehohle BCRA-CC Austria
Luwang Bandung BCRA-T Java
Luwang Bedesan BCRA-T Java
Luwang Bendo BCRA-T Java
Luwang Blekonang BCRA-T Java
Luwang Bodeh BCRA-T Java
Luwang Buhputih BCRA-T Java
Luwang Buriomah BCRA-T Java
Luwang Butiung BCRA-T Java
Luwang Ceblok BCRA-T Java
Luwang Cikal BCRA-T Java
Luwang Daren BCRA-T Java
Luwang Demplo BCRA-T Java
Luwang Gandek BCRA-T Java
Luwang Gebang BCRA-T Java
Luwang Gedilan BCRA-T Java
Luwang Gondang BCRA-T Java
Luwang Goplak BCRA-T Java
Luwang Jalak Bromo BCRA-T Java
Luwang Jaran BCRA-T Java
Luwang Jati BCRA-T Java
Luwang Jero BCRA-T Java
Luwang Jomblang (site 10) BCRA-T Java
Luwang Jomblang (site 175) BCRA-T Java
Luwang Jurangjero BCRA-T Java
Luwang Kamal BCRA-T Java
Luwang Karang BCRA-T Java
Luwang Karang Lamper BCRA-T Java
Luwang Kenteng BCRA-T Java
Luwang Ngepoh BCRA-T Java
Luwang Ngiratan BCRA-T Java
Luwang Ombo BCRA-T Java
Luwang Pace BCRA-T Java
Luwang Pileirang BCRA-T Java
Luwang Pongkok BCRA-T Java
Luwang Puniran BCRA-T Java
Luwang Seban BCRA-T Java
Luwang Seropan BCRA-T Java
Luwang Serpeng 2 BCRA-T Java
Luwang Setro BCRA-T Java
Luwang Sindon BCRA-T Java
Luwang Soga BCRA-T Java
Luwang Soka BCRA-T Java
Luwang Songjembal BCRA-T Java
Luwang Soroiten BCRA-T Java
Luwang Suru BCRA-T Java
Luwang Telaga Pilah BCRA-T Java
Luwang Tong Pocot BCRA-T Java
Luwang Towati BCRA-T Java
Luwang Watukebu BCRA-T Java
Luwang Wotawati BCRA-T Java
Lynkirk Cave MSG
M2 BCRA-T, Regards, CC Spain
M4 BCRA-T Canada
MacDonald's Folly CSS Mendip
Mad Pot IS Co. Fermanagh
Magharet el Kassaret D
Magnetometer Pot NPC, ULSA, CC, CUCC, LS
Magnum Pot GSG Argyll
Maldon School Cave BSA-CS
Malham Cove Rising YSS, CPC, CDG Malham
Maliu Kang China Caves China
Mam Tor Swallet B584 Derbyshire
Mamilchhohle Stalactite
Mammoth Cave BC, LS, Kentucky
Mangaia Caves CANC Cook Islands
Mangle Hole D
Mangrove Cay Blue Holes 32 & 33 BCRA-T Andros
Manor Farm swallet BEC, D, UBSS
Marble Arch Cave B031, CUCC Co. Fermanagh
Marble Cave BCRA-T Sarawak
Marble Pot CC, LS Allotment
Marble Sinks SP, ULSA, CPC, LS
Marble Steps Pot LUCC, D, NMCC, ULSA, LUPC, GSG, NCC, LS
Marcupine Pot CANC Canada
Mardiko Letzia CUCC Pyrenees
Marilyn (Gaping Gill) D N. Yorkshire
Markham Cave BCRA-T Australia
Marley Stalactite Cave BCRA-T Jamaica
Maskhill Mine LS, B546
Masson Box Complex (Cave & Mine) DCA, PDMHS, Masson audit Matlock
Masson Sough Mine PDMHS Matlock
Matienzo D Spain
Matka Vrelo Regards Macedonia
Matthew#1 Falls 1987 USA
Mauna Ulu Lave Caves BCRA-T Hawaii
Mayday Hole CPC
Mazarrasa LUSS, BCRA-T N. Spain
Maze Holes MSG
McGanns Cave IS Co. Clare
McShea's Mine (Green Laids Pot) LS West Kingsdale
Me No Sen Cave BSA-CS
Meandro dei traumi Facciali (CL32) Mondo Sotterraneo Italy
Mebikombogo Cave SUSS Papua New Guinea
Meekons Cave GSG, CDG Skye
Melidon Cave BC Crete
Melloch Mine Cave GSG Scotland
Mendips Cave CANC Canada
Mercavity Cave MC Avon Gorge
Mercer Caverns WSG USA
Meregill Hole ULSA, CI, LS, BSA-CS Ingleborough
Meridian Pot CC Leck Fell
Merlins Cavern BSA-CS, EPC
Mermaids Hole IS, CDG Co. Clare
Merosomados SUSS Crete
Meta Rift Cave OCC
Miao Keng D China
Middle Earth YSS New Zealand
Middle Flood (waterwheel Swallet) MCG Mendip
Middleton Dale Mines BSA-CS
Midnight Hole LCMRS
Mige Hole CDG Yorkshire
Migovec System, The CC, Regards, ICCC, IC, WSG Slovenia
Mill Bridge Cave CANC Canada
Mill Hill Sand Mine YSS Pontefract
Mill Pot LS
Milwr Tunnel D, B464, GCC, B664 Flintshire
Mina des Cami Endins Mallorca
Minas de los Ingleses RRCPC N. Spain
Minera Caves GCC Wales
Miners Hole SUSS
Minigill Cave CANC Vancouver Island
Miss Grace's Lane Cave D Gloucestershire
Mitchelstown New Cave B031
Mithia Kabarthura CC Crete
Mitterhornlhohle SUSS Austria
MM Mine D Somerset
MN 53 WSG Caucasus
Mohole, The D, BEC, LS
Moinhos Velhos (Great Cave) CRG-T Portugal
Moking Hurth (& Pot) CRG-T, MSG, D Teesdale
Mollebekkgrotten BCRA-T, SWETC Norway
Molnaaga Sinks GC
Monastir Cliff Pot SMCC, LS Ireland
Monday Mine TSG Derbyshire
Mondhohle B236 Austria
Mongo Gill SP, CPC, NCC Greenhow
Monk's Wood Cave BCRA-T N. Yorkshire
Monster Cliff System ULSA
Monte Enaso, Caves of BCRA-T Spain
Monte Kronio Stufe di S.Calogero Mondo Sotterraneo
Moose Cave DCA Castleton
Morgans Pond Cave BCRA-B, D Jamaica
Morris Cave Css USA
Mossdale Caverns ULSA, SP, BSA-P, LS, B187, BSA-CS
Mossdale Scar, Caverns of BSA-CS, MC
Mossy Hollow Cave (Uahm an Cos Mointeachail) GSG Skye
Mother Grundy's Parlour MSG
Mother Mac's Gully Hole CRG-T Jamaica
Motts Hole BPC, BCRA-T Gowerdale
Moulin, the BCRA-T Canada
Mount Nemo Cave CANC Canada
Mount Noll Hole CRG-T Jamaica
Mount Pleasant Cave GCC Wales
Mousegill Cave MSG West Stainmore
Mrtvo jezero (See des Todes) BCRA-T
Mud Slide Cave SUSS Skye
Mudstone Hole BCRA-T New Guinea
Mullamullang Cave SP
Mullinahone Tunnel Cave IS Co. Tipperary
Murton Cave BCRA-T N. Yorkshire
Music Hall Rising IS Co. Kerry
Mustard Pot MUSS
Muttseehohle Stalactite
Mystery Cave CANC Canada
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