| 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, D | 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 Son Doong | D | Vietnam | |
| Hang Tien | IC, E | Vietnam | |
| Hang Toi | E | Vietnam | |
| Hang Vom | IC, E | Vietnam | |
| Hanging Pot | RRCPC | ||
| 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 | ||
| Hardrawkin Pot and Caves | BCRA-CSS | Yorkshire | |
| Harehope Quarry Cave | MSG | ||
| Harry Becca Mine | DCA | ||
| Hartleycleugh Quarry Cave | LS, MSG | Carrshield, West Allen | |
| Hartsop Hall Mine | LS | ||
| Harwood Hole | CSS, CPC | New Zealand | |
| Hassan's Cave | BSA-CS | Malta | |
| Hatley Rocks | BEC | ||
| Hauchhohle | BCRA-CP | Austria | |
| Hausi-Oder Luegloch (Lettenloch) | BSA-CS | Austria | |
| Hause Waterfall Cave | CANC | USA | |
| Hause Waterfall Cave | CANC | West Virginia | |
| Hauzhu Yan System | China Caves | China | |
| Haveluliku Cave | NSS | Tonga | |
| 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, RRCPC | Casterton Fell | |
| Herbert's Quarry Cave | ISCA | Dyfed | |
| Heretic's Cave | GSG | Kishorn | |
| Hermit's Cave | ISCA | Tetbury | |
| 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 | |
| Hillocks Mine | BSA-CS | Derbyshire | |
| Hills Creek Cave | CANC | Canada | |
| Hirlatzhohle | BCRA-S, BEC | 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 Floor | D | Yorkshire | |
| 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, CWM | 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 | |
| Hospital Cave | ISCA | ||
| 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 | ||
| Hundsgfollhohle (Dog Trap Cave) | BSA-CS | Austria | |
| 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 | ||
| Hutton Ochre Cace (see Hutton Wood Mine) | |||
| Hutton wood Mine | BEC | ||
| 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, ISCA | 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, B725 | N. Yorkshire | |
| Ingresso Fornitori Tavola | Speleologica | Italy | |
| Iran | GSG | Iran | |
| Ireby Fell Caverns | NPC, NCC,SS, SUSS, NCC, CC, YSS, D, RRCPC | 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 | |
| JackdawQuarry Cave | ISCA | Gwent | |
| 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 | |
| Jenkin Beck Cave | RRCPC | ||
| Jeskynni Systemy Demanovska Doliny | CSS | Czechoslovakia | |
| Jewal cave | NSS | South Dakota | |
| 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 | |
| Jinglep[ot Hole | RRCPC | ||
| Jingling Pot | CC | ||
| Jingling Sike Cave | MSG | Hell Gill | |
| JK Cave | CC | Co. Kerry | |
| Jockey Hole | YSS | Allotment | |
| Joe's Cave | D | Co. Clare | |
| 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, BCRA-CS | Kingsdale | |
| Keldheads Cave | MSG | ||
| Kelebekli (Cave of the Butterfly) | RRCPC | Turkey | |
| Keltic Cavern (Reads Cave) | BSA-CS, D | Somerset | |
| 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 | |
| Kindo Cave | Speleologica | Ethiopia | |
| King Arthur's Cave | ISCA | Whitchurch | |
| 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 | |
| Klondike Pot | BPC | ||
| Knacker Trapper Pot | NCC, LS | Chapel-le-dale | |
| Knock Fell Caverns | GC, EN | N. Pennines | |
| Knocken Pot | BSA-CS, GSG | ||
| Knoglloch | BSA-CS | Austria | |
| Knotlow Caverns | EPC, LS | Derbyshire | |
| Kolkblaser - Monsterhohle System | IC | Austria | |
| Koona Koter | D | ||
| Krem Bylliat | Regards | India | |
| 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 | |
| Kugelgartenhohle (Bowling Alley Cave) | BSA-CS | Austria | |
| 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 | ||
| L'ebouleuse | Regards | ||
| La Ang Ang Kaip | BCRA-S | Cambodia | |
| La Ang Kuan | BCRA-S | Cambodia | |
| La Ang Taing Kluen | BCRA-S | Cambodia | |
| 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 la Murcielaguina de Hornes de Segura | Endins | Spain | |
| 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 Grotta piu lunga del Laos settentrionale | Speleologica | Laos | |
| 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 | |
| Labyrintgrottan | CDG | Sweden | |
| Ladypark Wood Cave | ISCA | Symonds Yat | |
| Ladypark Wood Mine | BSA-P, ISCA | ||
| 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 Hole - Dark side of the Grind | D | Casterton Fell | |
| Lancaster Hole | NPC, ULSA, D, BCRA-CSS | 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 | |
| Langsschnitt | BSA-CS | Austria | |
| 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 | |
| Lasgarn Quarry Cave | ISCA | ||
| 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 | |
| Lechugilla Cave | NSS | New Mexico | |
| Leck Beck Head | BSA-B, CDG, RRCPC | 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 | ||
| Legnagay Cave | D | Co. Fermanagh | |
| 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, ISCA | Cardiff, near | |
| Lesser Kelcow Cave | BSA-CS | ||
| Lettenloch (Hausi-Oder Luegloch) | BSA-CS | Austria | |
| 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, RRCPC | 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, ISCA | ||
| 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 | ||
| Llangynog Slate Mine | CWM | S. Wales | |
| Llewellyn Glacier Cave | CANC | Canada | |
| Lliwedd Copper Mine | GCC | Wales | |
| Llygad LLwchwr Cave | BC, CWM, ISCA | 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 Pool Sink | MSG | Gretadale | |
| 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 Elgin's Hole | YURT | Nidderdale | |
| Low Hall Cave | KCC | Dentdale | |
| Lower Arch Cave | BRPC | Ingleton | |
| Lower Calesdale Cave | SP(D&N), EPC | ||
| Lower Ceirog Cave | SMCC | N. Wales | |
| Lower Cheshire Wood Cave | D | Manifold Valley | |
| Lower Cullaun Zero | WRPC | ||
| Lower Easegill Cavern | see: Pegleg Pot | Leck Fell | |
| Lower Flood Entrance | MCC | Mendip | |
| Lower Hardgill Pot | LS | ||
| Lower Kirk Cave 6 | RRCPC | Easegill | |
| 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 Stone Farm Cave (Untere Steingut hohle) | BSA-CS | Austria | |
| Lower Traligill Cave | CRG-T, GSG | Sutherland | |
| Loxton Cavern | BEC, D, UBSS | Mendip | |
| Lubang Angin (Cave of the Winds) | CI | Sarawak | |
| Lucayan Cavern | B728 | Grand Bahama | |
| 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 | |
| Macizo de Mortillano | Regards | Spain | |
| 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 | ||
| Maple Leaf Cave | NSS | Missouri | |
| Marble Arch Cave | B031, CUCC, D | 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 | ||
| Mbetilonga Cave | NSS | Soloman Islands | |
| 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 | |
| Mearley Quarry Cave | UBSS (B722P) | Lancashire | |
| Meander Cave | CWM | S. Wales | |
| 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 (Cave) | BSA-CS, EPC, CWM, ISCA | Stoney Middleton | |
| Mermaids Hole | IS, CDG, D, ISCA | 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 | |
| Mine Pits, The | ISCA | Taffs Well | |
| Minera Caves | GCC | Wales | |
| Miners Hole | SUSS | ||
| Minigill Cave | CANC | Vancouver Island | |
| Mir Hole | RRCPC | ||
| 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 | |
| Moche Borago Gongola | Speleologica | Ethiopia | |
| 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 | |
| Monastir Sink | CDG | 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 | |
| Morlais Quarry Caves | ISCA | ||
| Morris Cave | Css | USA | |
| Mossdale Caverns | ULSA, SP, BSA-P, LS, B187, BSA-CS, RRCPC | ||
| Mossdale Scar, Caverns of | BSA-CS, MC | ||
| Mossy Hollow Cave (Uahm an Cos Mointeachail) | GSG | Skye | |
| Moth Cave (Ogof Gwyfyn) | CWM | ||
| Mother Grundy's Parlour | MSG | ||
| Mother Mac's Gully Hole | CRG-T | Jamaica | |
| Motts Hole | BPC, BCRA-T | Gowerdale | |
| Moughton Nab, Caves of | CPC | Yorkshire | |
| 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 | ||
| Mudfoot Hole | RRCPC | Ingleborough | |
| 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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