| aSurvey Name: | Where to be found | Additional Information | |
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| Nacimiento de Rio Cortines | CRG-T | ||
| Nacimiento del Poco Aguanaz | CDG | Spain | |
| Najdena Jama | YSS | Slovenia | |
| Nakimu Caves | CANC | Canada | |
| Nall Grove Mine | D | Derbyshire | |
| Nannup Cave | WSG | W.Australia | |
| Nant Gain Cave (Cilcain Cave) | B663 | NE Wales | |
| Nape Well Cave | CDG | Appletreewick | |
| Napps Cave | WP | Barrynarbor | |
| Napps Quarry Cave | Dorset | ||
| Napra | BCRA-T | Russia | |
| Nare | CI, E | Papua New Guinea | |
| Natty Gully Cave | CRG-T | Jamaica | |
| Natural Arch Series | GSG | Argyll | |
| Nazarovskaya - Osennyaya | B237 | USSR | |
| Nearcliff Wood Rift | MSG, YSS | ||
| Nedre Gaulstadgrotten | SWETC | Norway | |
| Nedre Svartvannsgrotten | CRG-T | Norway | |
| Needlehouse Gill Cave | GC | Wild Boar Fell | |
| Nenthead, Mines in the area of | GCC | ||
| Neptune Mine | TSG | Derbyshire | |
| Nervous Breakdown Cavern | OCC | ||
| Nesmolnelvgrotta | KCC | Norway | |
| Netherscar Cave and Pot | RRCPC, SS | ||
| Nettle Pot | BSA-B, BPC, DCA, D, LS | ||
| Nettlebed Cave | CI, D | New Zealand | |
| New Balch Cave | MCC, D | ||
| New Goydon Pot | CPC, ULSA, CUCC, SS, BCRA-S, CDG | N. Yorkshire | |
| New Hall Pots | BCRA-T | Jamaica | |
| New Oxlow Cavern | BSA-CS, BSA-B | ||
| New Pasture Cave | BSA-B | ||
| New Rake, shaft on | D | Derbyshire | |
| New St.Michael's Cave | BSA-CS, OUCC | Gibralter | |
| New Venture Mine / Cavern | SUSS | Derbyshire | |
| New Year Pot | NPC | Fountains Fell | |
| Newberry Pots | MSG | Teesdale | |
| Newby Moss Pot | GC | ||
| Newquay Cave | GSG | Newquay | |
| Newton Abbot Cave | BEC | ||
| Nguom Pag Bo System | IC | Vietnam | |
| Ni Hao Dong | China Caves | China | |
| Nick Pot | BSA-CS, ULSA, HCC, SS | ||
| Nidd Heads | CUCC, CDG | Nidderdale | |
| Nidlenloch | WSG | Switzerland | |
| Nine Barrows Swallet | BEC, SS, MC | ||
| Nirvana & Twang Cave | D | Dentdale | |
| No Business Blowing Cave | D | USA | |
| No Tul Cenote | CDG | Mexico | |
| Noddle End Hole | BSA-CS | ||
| Nong River Cave | CPC, LS | Papua New Guinea | |
| Noodle End Windypit | BCRA-T | N. Yorkshire | |
| Noon's Arch | B222 ,SUI | Co. Fermanagh | |
| Noraldograige | KCC, CPC | ||
| North Hill Swallet | MCC, D | Mendip | |
| North Pot | NCC, CPC | Greenhow | |
| Notts Pot | ULSA, NCC, BEC, LUSS, BUSS, SS, LUPC, CPC, CC, NPC, CDG | Leck Fell | |
| Notts Pot II | D | Leck Fell | |
| Nyrudhola | BCRA-T | Norway | |
| Nyth Bran Series | Wales | ||
| Oban-No-Ike-Cave | CDG | Japan | |
| OBJ Hole | LUSS | Ingleborough | |
| Ocean Hole | BCRA-T | Andros | |
| Ochochpec | CANC | Belize | |
| Ochochpec | CANC | Belize | |
| October Hole | ULSA | Selside | |
| Odloman Cave System | E | Phillipines | |
| Ogof Afon Hepste | CDG | S. Wales | |
| Ogof Afon Nedd Fechan (Little Neath River Cave) | |||
| Ogof Bwa Maew | BUSS, WSG | ||
| Ogof Cakin Fant | BEC | E. Mendip | |
| Ogof Capel | D, CSS, CDG | ||
| Ogof Capel Ddygen | B222 | Carmarthen | |
| Ogof Carno | CDG | S. Wales | |
| Ogof Cas, area of | WSG | ||
| Ogof Ci Coch | BC | S. Wales | |
| Ogof Cil-Yr-Ychen | B222, BC | Carmarthen | |
| Ogof Clogwyn | CSS | Clydach Gorge | |
| Ogof Corryn Cawraidd | D | S. Wales | |
| Ogof Craig-a-Ffynonn | D, BC, CCC, CC, LS | S. Wales | |
| Ogof Cwbl Hardd | WSG | Ystradfellte | |
| Ogof Cwm Hew Bweb | WSG | ||
| Ogof Cynnes | D, YSS | S. Wales | |
| Ogof Cyres | SWCC, CCC | ||
| Ogof Dan-y-Lleuad Wen | D | Dyfed | |
| Ogof Daren Cilau | CSS, BSA-CS, D, CC, BEC, CC, HCC, BCRA-S | S. Wales | |
| Ogof Dau Gi | SWCC | ||
| Ogof Diwedd Yr Enfys | SWCC | ||
| Ogof Draenan | D, CSS, CC, LS, WSG, CDG, OUCC | S. Wales | |
| Ogof Dulias | YSS | N. Wales | |
| Ogof Dydd Byraff | LUPC | ||
| Ogof Fach (Fechan) | CDG, LS | ||
| Ogof Fawr | WSG, D | S. Wales | |
| Ogof Fechan (Fach) | WSG, LS | ||
| Ogof Ffynnon Ddu | CRG-P, LUCC, SWCC, CRG-T, CDG, CSS, WSG, LS, D, SWETC | S. Wales | |
| Ogof Ffynnon Haddock | CSS | ||
| Ogof Ffynnon Taf | D | S. Glamorgan | |
| Ogof Foel Fawr | B222, CSS, SWCC | Carmarthen | |
| Ogof Glan Gwenglais | D | Dyfed | |
| Ogof Glan Hepste | CDG | S. Wales | |
| Ogof Gwaliau Gwynion | CSS | ||
| Ogof Hesp Alyn | BCRA-T, CC, B663 | NE Wales | |
| Ogof Llungwyn | CSS, CCC | Llangattock | |
| Ogof Llyn Du | CC, LS | Clwyd | |
| Ogof Llyn Parc | CC | N.Wales | |
| Ogof Nant Hyfryd | D | ||
| Ogof Nant Rhin | Croydon | Clydach Gorge | |
| Ogof Nant Rhin | D | Clydach Gorge | |
| Ogof Newport | CSS, CCC | Llangattock | |
| Ogof Noeth | GCC | Wales | |
| Ogof O'Flaln Y Waun | WSG | ||
| Ogof O'r Herwheliwr (Poachers Cave) | NPC | ||
| Ogof Pantllyn | D | Llandbie | |
| Ogof Pen Y Craig | BCRA-T | Carfdiff, near | |
| Ogof Pont Bont | CSS | ||
| Ogof Pont Sychryd | BUSS | ||
| Ogof Pwll Swnd | BC, B222 | ||
| Ogof Pysgodin Gwyn | D | ||
| Ogof Rhaedr Ddu | D | ||
| Ogof Rydd Sych | SP, WSG | ||
| Ogof Siani (Gas Pot) | GCC | Wales | |
| Ogof Triachwech | WSG | ||
| Ogof Twyn Tal Draenan | SWCC | ||
| Ogof Twyny Gloz | WSG | ||
| Ogof Uchel | B222 | Carmarthen | |
| Ogof Y Cae | B222 | Carmarthen | |
| Ogof Y Ci | SWCC | ||
| Ogof Y Garimperiros | SWCC | ||
| Ogof Y Gwnt | GCC | Wales | |
| Ogof Y Ychen | SWCC | ||
| Ogof Yr Esgyrn | BC | ||
| Ogof Yr Uwd Lwyd | D | S. Wales | |
| Ogofau Hengoed | B222 | Carmarthen | |
| Ogog Afon Hepse | WSG | ||
| Ogog Cadno | BC, CCC | Ystradfellte | |
| Ojo Goarena | SP | Spain | |
| OK Kumun Tem | BCRA-T | New Guinea | |
| Okinawa | B714 | Japan | |
| Okshola Kristihola | KCC | ||
| Old Ash Cavern (Mine) | MSG | Derbyshire | |
| Old Cote Pot | BPC | Littondale | |
| Old Engine Shaft | GCC | Wales | |
| Old Fox Hole, The | CANC | Scotland | |
| Old Fox Holes | GSG, CANC | ||
| Old Gang Mines | BSA-P | ||
| Old Homestead Cave | IC | W. Australia | |
| Old Ing Cave | CDG, YSS | Birkwith Fell | |
| Old Providence Mine | WRPC | Kettlewell | |
| Old Quarry Pot | CSS | Llanrhidian | |
| Old St. Michael's Cave | OUCC | Gibralter | |
| Old Storrs Cave | BRPC | Ingleton | |
| Oldbury Hill Rock Shelter | CSS, WP | Kent | |
| Ole Reppen's Hola | CSS | Norway | |
| Omolos Cave | WRPC | Crete | |
| Onune Magara | LUSS | N. Turkey | |
| Ooanagoloor (Coolanau) | MSG, D, IS | Co. Waterford | |
| Ore's Close Mine | OUCC | Mendip | |
| Orkan Hohle | CC, NCC, CSS | Austria | |
| Orlinnaja | B332 | Uzbekistan | |
| Ossicular Hole | GSG | Perthshire | |
| Osthullet | CPC, LS | ||
| Otter Hole | BC, CDG, D, BCRA-T, WSG, CSS, LS | Chepstow - Monmouth | |
| Otter Hole | GSG | Sutherland | |
| Otter's Cave | CPC | Coverdale | |
| Our Lady's Cave | RRCPC, D | Aygill | |
| Outlands Head Quarry Cave | EPC | Bradwell | |
| Ovens Cave | BC | Co. Cork | |
| Overholt Blowing Cave | CANC | USA | |
| Ovre Svartvannsgrotten | CRG-T | Norway | |
| Owillfore Tem | BCRA-T | New Guinea | |
| Owl Hole | D | Derbyshire | |
| Oxford Hole | BSA-CS | Casterton Fell | |
| Oxlow Cavern | ULSA, NCC, BSA-P, DCA, LS | ||
| Oyaskjeleren | BCRA-T | Norway | |
| Ozana Cave System | BCRA-T | Spain | |
| P102a (see: Quaking Pot) | See: Quaking Pot | ||
| P5 | BPC, CC, D, LS | ||
| P5 Swallet | DCA | Castleton | |
| P6 Dig, The | SUSS | Derbyshire | |
| P6 Eishohle | ULSA | Austra | |
| P8 (Jackpot ) | See: Jackpot | ||
| Padres Pot | GSG | ||
| Pal Y Cwrt No. 2 | B222, SWCC | Carmarthan | |
| Pan Hole | CRG-T | ||
| Pant Mawr Pot | CRG-T, LS, WSG | ||
| Paper Cave | GSG | Argyll | |
| Paper Mill Cave | RRCPC | Beetham | |
| Papoose Cave | CC | USA | |
| Parthenon Pot | BCRA-S | Crete | |
| Pate Hole | GSG, CDG, CPC, BEC, MSG | ||
| Patricks Rift | CSS | ||
| Pavie | EPC | Papua New Guinea | |
| Payo de Fresno | CRG-T | ||
| Peacock Springs Cave System | CDG | USA | |
| Peak - Speedwell System, The | LS | Derbyshire | |
| Peak Cavern | LS, BSA-CS, B, BSA-B, SUSS, D, CC, SWCC, DCA, TSG, BCRA-T, CDG | Derbyshire | |
| Pech Merle | WP | France | |
| Pedro Great Cave | CRG-T | Jamaica | |
| Peg Leg Pot | RRCPC, LS, NPC | Leck Fell | |
| Pegwell Sea Caves | WP | Kent | |
| Pen Park Hole | CRG-T | ||
| Pen y Fron Mine | GCC | Wales | |
| Pena Cavern | CRG-T | Portugal | |
| Pendleton Pipe | YURT | Greenhow Hill | |
| Penitentiary Holes | CRG-T | Jamaica | |
| Pentadaktylos Pot | BPC | Cyprus | |
| Penyghent House Cave Rising | CPC | Penyghent | |
| Penyghent Long Churn | ULSA, LS | ||
| Penyghent Pot | BPC, NCC, SP(D&N), ULSA, D, LS, B681 | Penyghent | |
| Percorso del Fiume Piuka (Pivka) | B681 | ||
| Permian Caves | SUSS | Knaresborough | |
| Perryfoot Swallet (Cave) | CC, DCA | ||
| Perry's Pot | MC | ||
| Persaervation Pot | DCA | ||
| Pestara Neagrel | WSG | Romania | |
| Pestera de la Astileu | BC | Romania | |
| Pestera Din Dealul Humpleu | WSG | Romania | |
| Peter Plummet | CDG, YSS | Spain | |
| Peterkin Pot | BSA-CS | ||
| Peterson Pot | LUCC, SUSS | Leck Fell | |
| Pete's Potty | OUCC | N. Spain | |
| Petit Chourun Clot, Le | RRCPC | ||
| Petrefakten | BSA-CS | ||
| Piaggia Bella | BPC, D, B236 | Italy | |
| Piani Eterni | Speleologia | Italy | |
| Picos de Cornion | CC | ||
| Picos de Europa | CPC | ||
| Pictor End Cave | SUSS | Derbyshire | |
| Pierre Saint-Martin | CANC, SCP | France | |
| Pierre St. Martin | ULSA, CI, B236, LS | ||
| Pigeon Hole | CDG | Galway | |
| Pikedaw Calamine Caverns | B222, NCC, LS, YSS, B597 | ||
| Pikhauggrottene | CRG-T, BSA-CS | Norway | |
| Pilkinton's Cavern | BCRA-T | Derbyshire | |
| Pillar Hole | YSS | Newby Moss | |
| Pinargozu Resergence | LUCC, LS, RRCPC, CSS | Turkey | |
| Pinhole | MSG | ||
| Pint Pot | GSG | ||
| Pinto Lake Caves | CANC | Canada | |
| Pipers Cave | GSG | ||
| Pippikin Pot | LS, LUCC, NPC, ULSA, NCC, CC, D | ||
| Pique Grane | BEC | ||
| Pirhuacocha Region, Geology of | BSA-CS, LS | Peru | |
| Pitchford's Resurgence Cave | CANC | Canada | |
| Pivka (Percorso del Fiume Piuka) | B681 | ||
| Placentra Pot | CC, DCA | Derbyshire | |
| B718 | B718 | Yugoslavia | |
| Platteneckhohle | B236 | Austra | |
| Playshcool Pot | OUCC | N. Spain | |
| Pleasley Vale Railway Cutting Pot | MSG | ||
| Pluais An Sciathain Leathair | IS | Co. Cork | |
| Plunge Hole | DCA | Buxton | |
| Poachers Cave (Ogof O'r Herwheliwr) | NPC | ||
| Poachers Cave (Ogof O'r Herwheliwr) | BN663 | NE Wales | |
| Point Edward Cave | CANC | Canada | |
| Pol Eighe (File Pot) | GSG | ||
| Poljska Jama | BCRA-S | Slovenia | |
| Poll an Ionion | B205, CPC, CSS, UBSS | ||
| Poll An Tobar | UBSS | Co. Clare | |
| Poll Chait | IS | Co. Cork | |
| Poll Chnoc an Spa | IS | Co. Kilkenny | |
| Poll Cragreagh | HCC | Co. Clare | |
| Poll Donough (& North) | SWETC | Ireland | |
| Poll Eidheann | BCRA-T | ||
| Poll Gorm | CROY | Ireland | |
| Poll Iffrin | BCRA-T | ||
| Poll Kilmoon East | B205 | ||
| Poll Na Damclean | GSG | Sutherland | |
| Poll Na Gceim | CC, D, HCC, IS | Co. Clare | |
| Poll Na Leppechauns | CPC | ||
| Poll Seomar (Chamber Pot) | D, GSG | Argyll | |
| Pollaille | CUCC | Co. Leitrim | |
| Pollaloughabo | CDG | Galway | |
| Pollapooka 1 & 3 | CSS | Co. Clare | |
| Pollaraftra | BEC | ||
| Pollasillagh | CRG-N | Ireland | |
| Pollatoomary | D | Ireland | |
| Pollballiny | B205, CPC, CSS, UBSS | ||
| Pollballyelly | CSS, LS | Co. Clare | |
| Pollballyshanny | CSS | ||
| Pollbeahan | CDG | Galway | |
| Polldinna | CUCC | Co. Leitrim | |
| Pollduagh/ The Churn | D | Ireland | |
| Polldubh | B205, CPC, CSS, UBSS, D | ||
| Pollelva | B205, CPC | ||
| Pollfrughlisk | WSG | ||
| Pollhoish | CDG | Galway | |
| Pollingdang | CUCC | Co. Leitrim | |
| Pollna Crom | CPC, D, IS, HUSS | Co. Fermanagh | |
| Pollnacrom | LS | Ireland | |
| Pollnagollum | CUCC, WSG, IS | Co. Fermanagh | |
| Pollnagollum of the Boats | IS | Co. Fermanagh | |
| Pollnapatsy | CDG | Galway | |
| Pollnatagha | CUCC | ||
| Pollskeheenhrinky | BEC, IS | Co. Tipperary | |
| Pollthanacarra | IS | Co. Fermanagh | |
| Polltullybrack | IS | ||
| Polnangclde | CSS | Co. Clare | |
| Poloska Jama | Yugoslavia | ||
| Polyfilla | B187 | Co. Fermanagh | |
| Pont Newydd Rising | CDG, YSS | Denbighshire | |
| Pool Cave | BCRA-T | Norway | |
| Pool Sink | LS | Easegill | |
| Poole's Cavern | EPC | Buxton | |
| Poor Farm Cave | CANC | USA | |
| Popples, The | CDG | Dentdale | |
| Popskata Dubka | SUSS | Bulgaria | |
| Porcupine Cave | BCRA-T, CC | British Columbia | |
| Pork Sandwich Shaft | D | Derbyshire | |
| Porth y Ogof | D, CRG-T, BC, UBSS | ||
| Porthole | RRCPC | Barbondale | |
| Porthole | CC | East Kingsdale | |
| Portland, Isle of | Dorset | ||
| Posongave | E | Papua New Guinea | |
| Postojnske Jame | ICCC | Slovenia | |
| Postonja | NCC, CRG-T, B718 | Yugoslavia | |
| Pot Deux (Pot II ) | ULSA | Vercors | |
| Potter's Cave | SWCC | Caldey Island | |
| Potts Moor Cave | BPC | Littondale | |
| Pou des Fumassos | Endins | Mallorca | |
| Poul Donough North | SWETC | ||
| Poul Skeheenarinky | SUSS | ||
| Poulakeol | CC | Co. Kerry | |
| Poulamuck | GSS | ||
| Poulawillin | BPC | Co. Clare | |
| Pouldermet | CC | Co. Kerry | |
| Poulnagollum | IS | Co. Clare | |
| Poulnagree | B205 | ||
| Poultalloon | IS | Co. Clare | |
| Pounder Lane Cave | D, DCA | Derbyshire | |
| Pozo Bajo del Sedo | CC | Spain | |
| Pozo Chicago | D | Spain | |
| Pozo de Cuetalbo | CC | Spain | |
| Pozo de Fresno | OUCC | N. Spain | |
| Pozo de los Caracoles | OUCC | N. Spain | |
| Pozo de Vega el Forcau | OUCC | Spain | |
| Pozo de Vega Huerta | CC | Spain | |
| Pozo del Arguelles | CC | N. Spain | |
| Pozo del Caballo Cimeru | CC | N. Spain | |
| Pozo del Cantu del Hombre | OUCC | N. Spain | |
| Pozo Della Neve | B236, Speleologia | Italy | |
| Pozo Estella | B236 | Spain | |
| Pozo Las Perdices | OUCC | Spain | |
| Pozo los Texas | CPC, OUCC | Spain | |
| Pozo Optimisto | OUCC | N. Spain | |
| Pozo Palomeru | CRG-P | N. Spain | |
| Pozo Paso Doble | OUCC | Spain | |
| Pozu Cabeza Julagua | CC | N. Spain | |
| Pozu Cabeza Muxa | CC | N. Spain | |
| Pozu Cebolleda | B236 | Spain | |
| Pozu de la Cistra | OUCC | N. Spain | |
| Pozu de la Pessimista | CSS | N. Spain | |
| Pozu de Vayeya | OUCC | N. W. Spain | |
| Pozu del Joe 90 | OUCC | N. Spain | |
| Pozu del Ojo de la Bruja | CC, OUCC, LS | N. Spain | |
| Pozu del Xin | LS | ||
| Pozu del Xitu | CC, IC, OUCC, CSS | N. W. Spain | |
| Pozu Jorcada Blanca | CC, D, OUCC | N. Spain | |
| Pozu Jultayu | CC | N. Spain | |
| Pozu los Caracoles | CC, OUCC, LS | N. Spain | |
| Predjama | B187, B718 | Yugoslavia | |
| Prices Dig | CSS | Llangattwg | |
| Priddy Green Sink | GSG, D | Mendip | |
| Pridhamsleigh Cavern | BSA-CS, CDG | ||
| Priesttown Cave | IS | Co. Tipperary | |
| Prima | B332 | Uzbekistan | |
| Primadona | ICCC | Slovenia | |
| Priorsdale Cave | MSG | ||
| Pritchards Cave | OCC | Manifold Valley | |
| Prods Pot | WSG, CDG, IS, LS | Co. Fermanagh | |
| Projects Cave, The | CANC | Canada | |
| Propast Pema | BC | Montenegro | |
| Prophet's Cave | BCRA-S | Spain | |
| Proventina | CRG-N, BSA-P, CI | Greece | |
| Providence Pot | CPC | ||
| Prpoastna Pyescher | ULSA, LS | Bulgaria | |
| Puffball & Icing Sugar Cave | CC | Austria | |
| Puits d'Anglais | CRG-OP, KCC, LUPC, CUCC, LS | Pyrenees | |
| Puits de Cinde Blanque | see Puits d'Anglais | Pyrenees | |
| Puits de la Broche | CSS | France | |
| Puits Francis | B236 | France | |
| Pumphouse Cave | BSA-CS | ||
| Pungi Rota | BCRA-T | Indonesia | |
| Puron Cave | CRG-T | ||
| Putwell Mine | PDMHS | Derbyshire | |
| Pwll Dwfn | NCC, CPC, WSG, MCG | Breconshire | |
| Pwll Pindar | WSG, D | ||
| Pwll Y Coeden Gnau | WSG, SWCC | ||
| Pwll Y Gwynt | CSS, D, CCC, CC | ||
| Pwll Y Pasg | BSA-P, CCC, CSS | ||
| Pwll Y Rhyd | D, CCC | ||
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