Surveys – Descent Magazine https://www.descentmagazine.co.uk The magazine of underground exploration Mon, 29 Dec 2025 15:59:37 +0000 en-GB hourly 1 https://wordpress.org/?v=6.9.4 https://www.descentmagazine.co.uk/wp-content/uploads/2023/10/cropped-favicon-23b-32x32.jpg Surveys – Descent Magazine https://www.descentmagazine.co.uk 32 32 211121256 Survey Index U https://www.descentmagazine.co.uk/surveys/survey-index-u/ Mon, 18 Jul 2022 10:39:04 +0000 https://www.descentmagazine.co.uk/?post_type=surveys&p=1492
CAVE/COUNTRYREGION/EXTENSIONREFERENCE
Uachdar, Uamh nan103:33
area maps103:32
Uamh an Claonaite50:30, 126:31, 204:12
Sumps 4-6113:22
The Treen Scene107:19
Uamh an Coire Domhain109:16
Uamh an XXXX109:17
Uamh na h-AiseirghAshery Pot272:12, 274:12, 277:10
Uamh na Sgoltaidh Dhuibe79:18
Uamh nan Clachan Dubhan266:19
Uamh nan Claig-Ionn37:6
Uamh nan Naomh Seras155:17
Uamh nan Uachdar103:33
area map103:32
Uamh Sgeinne19:16
UkraineOptimisticheskaja98:33, 206:21
Ullet Gill Cave98:13
Upper ANUS Cave 4107:18
Upper Canada Cave197:12, 244:11
with The Paddock extension245:7
with The Log Pile extension248:8
Upper Cradle Hole208:11
Upper Flood Swallet193:21, 195:10
Chuckle’s Joke217:17
East Passage and Rift Series205:16
Golden Chamber extensions189:16, 191:18
Upper Hackergill Cave127:9
Upper Lathkillcaves of97:10
UNCABAC254:31
UralKapova Cave121:38
Urchin Cave (Green Holes)76:13
USABarrack Zourie Cave109:18
Black House Mountain System136:23
Blue Spring Cave98:17
Crabby Cave106:26
Green Fork Falls Cave34:41
Hawaii, area map42:20
Hawaii, Kazamura Cave118:25
Jewel Cave206:23
Kathy’s Icebox34:41
Lechuguilla Cave79:34-5, 206:22, 269:26-7
Lechuguilla Cave: Higher Education269:27
Lechuguilla Cave: Neuland251:30,31
Mammoth Cave System206:20
Mammoth/Flint Ridge System23:24
No Business Blowing Cave81:34-5
Three Door Cave106:26
Wakulla Springs137:22
Wind Cave259:34
Zicafoose Blowhole183:27
Uwd Lwyd, Ogof yr187:27
UzbekistanBoybuloq282:28-9
Visnevsku282:28-9
]]> 1492 Survey Index X, Y, Z https://www.descentmagazine.co.uk/surveys/survey-index-x-y-z/ Mon, 18 Jul 2022 10:38:46 +0000 https://www.descentmagazine.co.uk/?post_type=surveys&p=1491
CAVE/COUNTRYREGION/EXTENSIONREFERENCE
Xenophobia Cave242:8
XXXX, Uamh an109:17
Yat Grotto304:38
Yockenthwaite Potrigging topo300:11
ZimbabweMawenge Mwena (Z9)122:34
]]> 1491 Survey Index W https://www.descentmagazine.co.uk/surveys/survey-index-w/ Mon, 18 Jul 2022 10:38:34 +0000 https://www.descentmagazine.co.uk/?post_type=surveys&p=1490
CAVEREGION/EXTENSIONREFERENCE
Wakebarrow Pot60:16-17
Walditch Cave82:30-1
Wardlow SoughSurvex plan271:12
Ward’s Hill Quarry Caves291:8
Washfold Pot156:10
Watch Hill Cave161:21
Watch Hillarea map161:20
Water Caverns, The119:26
Water Icicle Close Cavern212:21
Northwest Passage Aven209:17
Surface view with cave overlay268:14
Waterways Swalletextension126:14
Room 101203:11
Watson’s Swallet141:13
Wensleydale Railway165:8
Westbury Brook Iron Mine112:21
Whalf Mine Climbing Shaft142:31
Whalf Mine Engine Shaft154:33
Wee Pot281:29
Wellington Hole265:15
West Sink301:35
Whim Mine123:12
White Keld250:29
White Rake232:12
new shaft227:17
White Scar CaveSleepwalker Series107:9
White Spot Cave229:25
Wigmore Swallet101:31, 112:14, 199:24
Downstream Sumps110:11
Young Bloods’ Inlet199:25
Wigpool Cave220:18
Winnats Head CaveWigwam Streamway221: 36
Witches IIand Shuttleworth Pot218:23
Withyhill Cave51:35
Wizards Chasm147:27
Wold Cleugh caves281:8
Wookey Hole181:20-1
Beyond the Thunderdome160:24,25
Cam Valley Crawl54:17
Edmunds’ Chamber160:24,25
elevation36:30, 54:15
Hallowe’en Rift proximity212:11
Land of Hope and Glory277:27
Sump 25177:27, 179:18
Woolaston Wood Cave265:16
]]> 1490 Survey Index V https://www.descentmagazine.co.uk/surveys/survey-index-v/ Mon, 18 Jul 2022 10:38:24 +0000 https://www.descentmagazine.co.uk/?post_type=surveys&p=1488
CAVEREGION/EXTENSIONREFERENCE


]]> 1488 Survey Index T https://www.descentmagazine.co.uk/surveys/survey-index-t/ Mon, 18 Jul 2022 10:38:17 +0000 https://www.descentmagazine.co.uk/?post_type=surveys&p=1487
CAVE/COUNTRYREGION/EXTENSIONREFERENCE
Tearsall Pipe CavernSump & Pool Series connection122:8
ThailandFossil Cave125:19
north-west area map119:35
Tham Bpaet Sip258:29
Tham Chet Mit130:33
Tham Din Pieng304:31
Tham Huai Tong Thai172:33
Tham Jong Ang172:32
Tham Luang263:25, 264:25, 277:22-3
Tham Maa / Tham Yang258:28
Tham Nam Lai302:25
Tham Nam Pu302:27
Tham Nam Tok132:25
Tham Pha Daeng274:14
Tham Pha Phueng210:33
Tham Phra Sai Ngam280:18
Tham Phra Wang Daeng137:23
Tham Seua/Tham Lom119:35
Tham Sra Yuon Thong216:29
Tham Nam Tok/Tham Tiang297:37
Thor’s Rising105:8, 215:10
Thorntree Shaft116:9
Three Counties System159:21, 215:20
connection223:32, 225:21
hydrology8:5, 18:17-18
overview215:19
Thrope Edge Pot244: 9
Thrupe Lane Swallet28:7
Atlas Aven99:9
Atlas Aven extensions101:18
Atlas Pot108:26
Thrupe Swallet158:13, 175:11
Tilberthwaite Mine105:8
Tin Pot Two198:11
Tolerance Pot242:8
Tongaarea map74:29
First Cave74:30
Town Drain270:11
Tramp’s Hole97:31
Trans-Craven System18:17-18
Trapdoor Pot154:29, 164:31
Treak Cliff Cavern260:26
Triachwech, Ogof179:23
Trinafour Rising Cave209:14
Triple Hole24:13
Troutsdale Windypit121:8
Tub HoleThird Pool Sump109:13
Tullybrack Mtcaves of45:28
Tullyholvin Rising215:16
Tullyhona Rising Cave228:13
Cryptozoological Mystery Tour269:20
Tunnel CavePaul & Barnabas Extension34:27
TurkeyMartal Magarasi148:29
Taurus Mts area map87:28
Twang Cave131:24,25, 138:32, 140:22
Tween Twins Hole250:12
Twin Titties99:30
Twll Dychrynllydsee Blaen Hepste Hole
Tyning’s Barrows Swallet1:11, 36:5, 38:51
]]> 1487 Survey Index S https://www.descentmagazine.co.uk/surveys/survey-index-s/ Mon, 18 Jul 2022 10:38:12 +0000 https://www.descentmagazine.co.uk/?post_type=surveys&p=1486
CAVEREGION/EXTENSIONREFERENCE
Saga Hole224:8
Sandford Levvy / Pearl Mine261:26
Sarawaksee Mulu
Sardiniaarea map94:21
Sa Oche94:23
Sa Oche, area map94:21
Su Bentu94:23
Su Bentu, area map94:21
Satire Cave173:10
Saturday Hole9:18
correction to10:24
Saudi Arabialava fields215:31
Scars Hole170:28,29
Schwyllhydrology141:22
Scoska Cave36:20
Ancient Way51:11
Seathwaite Lead Mines82:27, 86:23
Sell Gill Holes129:12, 172:21
historical survey158:30,31
Sgeinne, Uamh19:16
Sgoltaidh Dhuibe, Uamh na79:18
Shag Cliffcaves of, area map119:26
Shakespeare’s Cave85:20-1
Shannon Cave202:33
High-level passages256:16, 267:16-17
Sandman’s Layer303:15
Shannon Cave/Polltullyard185:33
Shannon Pot209:32-3
Sharks Tooth Cave102:8
Shatter Cave (Mendip)5:18-19, 51:35
Shep Pot230:21
area survey of Leck Fell230:24
Notts Permitted Extensions232:8
Sherford Cave285:36
Simpson PotStorm Pot area243:31
Shipham (Mendip)shaft near167:13
Short Long Drop Cave195:12
Shute Shelve Cavern109:31
Shuttleworth Potand Witches II218:23
Sidetrack Cave169:26
Silver Eye Mine281:10
Sinc-y-Giedd227:8
Singing River MineChocolate Salty Balls Passage147:16
Single-Way Mine208:17
Skullcap Cave97:31
Slaughter Stream Cave (Wet Sink)100:27, 142:15
Downstream Sumps105:11
Flow Choke Passage102:16
hydrology100:26
Late for Dinner129:30
Long Round Trip299:25
The Remelt Plant142:14
Three Deserts101:11
Sleets Gill Cave106:21
Slieve Elva Pot44:15
Sloping Cave295:8
SlovakiaStratensk jaskyna122:26
SloveniaSistem Migovec262:31,32,286:20-1,22
Skocjankse jame (3D model)268:22
Sistem Primadona275:34
Sludge Pit Hole266:41
Smokey Hole57:10,11
Smoo Cave116:21
Smuggler’s Hole119:27
Snaiza Cave146:16
Snow Blindness Cave242:8
Solomon’s Drift64:26
Son of Longcliffe261:35
South AfricaBushmansgat134:29
South Towy Lead Mine271:14
SpainAranonera, Sistema238:16
Ario Project231:35
Azpilicueta, Torca de, link area108:16
BigMat Calf Hole, Torca la Vaca246:30
BU5648:24-5
BU56 area map48:27
Carlista, Torca del: Gran Sala Jon Arana245:35
Chicago, Pozu198:20-1
Conjurtao, Sistema74:21
Cueto, Sima del287:21
Culiembro, Cueva219:32-3
El Manadero159:25
F2074:23
F20, area map71:19
Fou de Bor, Sistema de la225:35
Fuente Azul157:35
GESM, Sistema Sima: Sumps 1 and 2 and surrounding passages244:21
Grajera, Torca de la287:22
Jorcada Blanca, Pozu54:29
Mazuela, Torca de la287:24
Muerdago, Torca del (Mistletoe Pot, Site 2081)286:30
Nacimiento, Cueva del (Cueva del Agua)263:21,22
Picos de Europa, Ortiguero area map2:7
Picos de Europa, Picos de Cornión area map231:35
Porron, Torca del254:25
Pozo Azul217:25
Pozo Azul area map296:28-29
Renada, Cuevo de la, link area108:16
Riano, Cueva de [section of survey used to create 3D model]234:36
Silvestre, Cueva de la (T20A)270:19,20-21
Tormenta, Pozo169:30
Trumbio, Cueva del287:19
Yusa, Torca de la287:21
Xitu, Pozu del49:31
Xitu, Pozu del, area map54:26, 67:34
Xitu, Sistema231:35, 233:37
see also Canary Islands and Mallorca
Spar Pot57:13, 216:11
Speedwell CavernMain Rising127:17
Peak Cavern connection area118:8
western limits127:17
Spider Cave (Derbyshire)114:10
Spider Windypit106:12
Sruh Croppa River Cavesarea map34:11
St Brendan’s Fissure44:17
St Dunstan’s Well Cave[incorrectly titled on page]19:27
St George’s Cave155:17
Stainsby’s Shaft205:18
Stalactidau Ddu, Ogof232:26
hydrology232:27
Stenkrith Cave25:12
Steps Potrigging topo205:9
Sting Pot149:15
Stock Hill Mine Caveextensions 2019270:17
Stock’s House Shaft155:16
Stoke Lane SlockerWest London Extension25:24
Stone Lever Pot158:11
Stoney Middleton Master Cave285:19,20-1
Storr’s Commonarea map37:33
Strangle Pot160:34
Strawberry Pot156:12
Streaks Pot97:11
Stukbar Pot187:29
Stump Cross Caverns117:20
Fairy Palace162:12
Sunday Mine225:8
Swallet P7163:11
Swan Dike Pot62:12-13
Swan MineWestern Series182:13
Swildon’s Hole90:21, 194:21
Fault Chamber aven36:9
Mud Sump168:26
Old Approach area64:8
Priddy Green Sink connection131:19
Sump 12171:34
Swynne-Puke round-trip227:26
Watergate/Paradise Regained54:10, 90:23
Swilly HoleExtension101:26
Swindon Hole174:27
SwitzerlandHolloch69:29, 206:21
JCB Hohle21:31
Shelter Pot4:23
Siebenhengste-Hohgant-Hohlensystem71:29, 81:19, 87:16
Sygun Copper Mine3D surface elevation167:7
]]> 1486 Survey Index R https://www.descentmagazine.co.uk/surveys/survey-index-r/ Mon, 18 Jul 2022 10:38:06 +0000 https://www.descentmagazine.co.uk/?post_type=surveys&p=1485
CAVEREGION/EXTENSIONREFERENCE
Rabbit Mine (Godstone)242:34
Raisgill Wood Cave233:8
Raisgill Wood Pot231:30
Rana Hole199:27, 204:12
Rat Hole69:30, 75:26
Raven Mine112:18, 113:18
Raven Scarnew cave at71:14
Rawthey Cave129:13, 142:20
The Wolf Den142:22
Read’s Cavern55:10, 274:31
Schematic232:32
Read’s Grotto214:21, 216:27
Red Kite Cave155:13
Redhouse Lane Swallet110:16
Fossil Series Extensions114:12
West Way294:16
2024 discoveries301:24-25
Reef Caves (Doolin)78:12, 209:25
Reservoir Holeincluding The Frozen Deep and association with White Spot Cave and Gough’s Cave229:25
The Frozen Deep and Ceiling Around233:12
Pulsation Aven and Jill’s Slither267:13
Reyfad Pot40:18, 96:27
and Tullybrack Mt caves45:28
hydrology96:26
Pollnacrom link33:45
Scraper’s Hole extension30:46
Reynold’s Rift28:14
Rhino RiftLeft-hand Route147:14
Ricklow Cave128:13
Riders on the Storm Traverse233:35
Ridge / Monk’s Park Quarries233:10
Rift Pot215:24-5, 236:20-1
area map58:8
to Low Douk Cave connection233:17
Second Hand Streamway234:13
topos250:10
Roaring Hole50:24,25
Robbers’ Den Cave101:16, 218:6
Robin’s Shaft Mine48:17
Rocky Acres Cave139:16
Rod’s Pot199:9, 219:10
RomaniaMovile Cave224:28
Rooska Cave227:19
Rough Pot166:11
Rowten PotOblib Traverse110:8
Rowter Hole219:27, 238:35, 239:22
Rubble Rift211:12
Rushup EdgePeak Fault area map148:35
Russet Well52:17
hydrology49:39
RussiaDark Star Cave99:29
Hodja Gur Gur Ata Ridge90:31
Iljukhina System100:34
Kristalnaja32:20
Ozernaja98:33
Pinega karst area map118:21
Stonewall Cave132:32
ZV 52124:18
]]> 1485 Survey Index Q https://www.descentmagazine.co.uk/surveys/survey-index-q/ Mon, 18 Jul 2022 10:38:00 +0000 https://www.descentmagazine.co.uk/?post_type=surveys&p=1484
CAVEREGION/EXTENSIONREFERENCE
Quaking Pot86:34
Rigging topo267:33
Quarters Farm Swallet167:15
]]> 1484 Survey Index P https://www.descentmagazine.co.uk/surveys/survey-index-p/ Mon, 18 Jul 2022 10:37:55 +0000 https://www.descentmagazine.co.uk/?post_type=surveys&p=1483
CAVE/COUNTRYREGION/EXTENSIONREFERENCE
P5 (Ingleborough)70:22
P7 (Derbyshire)163:11
P8 (Jackpot) Sumps90:10, 91:28
PakistanPir Ghaib Ghara144:30
Pal-y-Cwrt No. 2250:34
historical survey, 1954250:35
hydrology and dye-traces250:36
PanamaIsla Bastimentos caves190:25
Pant Lode116:9
Pant Mawr Moorhydrology153:34, 201:14
Pant Mawr PotHydrant Passage117:12
Papua New GuineaAtea Kananda78:32
Muller Range area map78:30
Muruk Cave144:20-1
Nare64:20
Nare area map59:22, 64:22
Nare hydrology65:26
Southern Highlands area map with cave locations250:22
Paracetam ‘Ole152:11
Parc Minearea map24:18
Park Corner Swallet37:43
Parkes Pot279:12
Parkinson’s Pot177:30
Pasture Gill PotRigging topo281:9
Patrick’s Rift (Beachy Head)48:31
Peak CavernBoom239:34
Buxton Water Aven elevation299:12
Cliffhanger extensions259:10
Deep Thought200:17
Donatella’s Mud Sump Aven Series202:9
Doom’s Retreat194:9, 206:9
Echo Chamber245:10
Far Sump Extension48:11, 187:15
Far Sump46:37
Galena Rift146:12
hydrology49:39
Ink Sump46:37
Keani Urarobu250:21
Krypton Series251:18
Lumbago Walk extension221: 37
Moosetrap Inlet Series194:11
Moosetrap Inlet Sump184:17
Moss Chamber-Entrance62:20-1,24
Nameless Series265:12, 276:28
Ride of the Valkyries86:29
Salmon’s Cavern85:28
Speedwell connection area118:8
Spidros Aven259:10
sumps in44:33, 48:11
The Rasp181:10, 192:11
Watershed Aven239:34
White River Series101:21
Pearl Mine / Sandford Levvy261:26
Pegleg Pot and Freda’s Hole298:11
Pen Park Hole111:27, 252:34
Penyghent Pot110:9
Friday the Thirteenth Series73:15
Living Dead Extensions89:26
Rigging topo254:9
Persil Rift283:18
Perran St George Mine242:12
PeruQaqa Mach’ay185:22
Sima Pumacocha161:19, 185:20
Tragadero de la Soledad297:28
PhilippinesQuibal Cave100:21,23
San Carlos Cave100:23
Piece End Swallet144:9
Pierre’s Pot220:9
Downstream passages222:16
Pigeon Hole168:30
Pigeon Pots173:12
Pikedaw Calamine CavernsCovid Crawl extension278:12
Pilgrim Pot278:36
Pillar Holes156:29
Pindale Cave208:9
Pippikin PotBeelzebub’s Hairy Ringpiece139:10
Extreme Ways169:34
hydrology83:6
The Pleasant Way area281:35
Pippikin Sinkand Pot (elevation)227:10
Pittington Pot271:11
Pittington Rift271:11
Pluais an Sciathain Leathair100:11
PolandNad Kotlinami, Jaskinia20:29
Snieznej, Jaskinia20:29
Pol-an-Ionain99:16
Poll Breugair255:14
Poll Chit112:22
Poll na gCeim69:14, 70:15, 89:14
Downstream Sump 5104:30
Sump 176:10
Sump 275:13
Poll Gonzo214:16
Poll Gonzo North233:14
Poll Seomar64:10
PollahuneMayfly Extension98:7
Pollaloughabo110:25
Pollaraftara45:28, 114:21-2, 121:15
Pollatoomary (Pollflanagan)204:20,21, 263:15
Pollbeg158:16
Pollbehan110:25
Pollcnamhin238:9
Polldeelinto Polltoophill traverse223:35
Polldough269:21
Pollduagh/The Churn196:16
PolldubhFiggbrigg Series203:12
Pollnacrom40:18
Reyfad link33:45, 96:26-7
Reyfad, relationship to30:46
and Tullybrack Mt caves45:28
Pollnagollum (Co. Clare)see Poulnagollum
Pollnagollum of the BoatsExtension 2013231:14
Pollnagort279:13
Pollnagot (Cat’s Hole)248:16, 250:17
Pollnagran175:15
Pollnapuisin (Kitten’s Hole)250:17
Polltoophillto Polldeelin traverse223:35
Polltullyard209:32-3
Pork Sandwich Shaft171:21
Porth yr Ogofresurgence109:23
Upstream Sumps6:19, 17:6
PortugalAlgar Nova70:25
Pot Black296:10
Poulelva Potsee Poulnagollum-Poulelva System
Poulgorm Caves266:19
Poulnafearbui216:16
Poulnagollum–Poulelva SystemFirst Waterfall extension208:12
Midnight Series208:11
Pollbeg relationship158:16
Poulelva area67:14
Southeast Tunnel152:16
Sump Canyon extension68:12
The Maze157:32
Poulnagee (B12)227:18
Poulnagree82:7, 95:15, 149:34
Poultalloon126:23
area map126:16
Pounder Lane Cavern37:14
Powerscourt Deerpark Cave175:14
Priddy Green Sink131:19
Pridhamsleigh Cavern129:22
Prid II107:29
Primrose Cave25:11
Prod’s Potarea map34:11
Pwll Duarea map 1921158:28
land sale136:10
Pwll Pindar86:26-7, 177:22
Pwll-y-Coeden Gnau177:21
Pwll-y-Cwm72:29, 115:31
Pwll-y-Gwynt49:41
Pwll-y-Rhyd77:20
]]> 1483 Survey Index O https://www.descentmagazine.co.uk/surveys/survey-index-o/ Mon, 18 Jul 2022 10:37:50 +0000 https://www.descentmagazine.co.uk/?post_type=surveys&p=1482
CAVEREGION/EXTENSIONREFERENCE
O’Flaen-y-Waun, Ogof117:11
Oblivion Rift Cave257:14
Oddmire Pot248:334-5
Ofapi Pot141:10
Ogof Capel69:9, 77:17, 78:17
Ogof Capel Faen284:10
Ogof Carno182:21
1991 Series102:21, 103:34
Blight of the Fumble Bee112:17
Dill and Imaginary Menagerie182:22
extensions 1992106:8
High Anxiety109:8
Littoral Zone111:26
Open Season & The Precious Years105:21
Poseidon Series166:24
Space Oddity116:25
True Grit116:25, 120:12
Ogof Cil yr Ychen84:16,17
Ogof Corryn Cawraidd91:33
Ogof Cragen177:20-1
dye-traces177:20
Ogof Craig a Ffynnonarea map38:23
hydrology61:20-1, 76:20-1
Ogof Cwbl Hardd95:23
Ogof Cynnes112:30
shakeholes near100:42
Ogof Dan-y-Lleuad Wen104:35, 113:11
Ogof Ddwy Sir140:35
Ogof Draenen121:23, 122:21, 132:22, 163:37, 189:8
area map121:22
Big Country127:34
Bit of a Dive123:22
Dollimore Series134:21,22
Entrance series119:12, 121:25
Galera Garimpeiros124:31
Hexamine Highways131:35, 132:10
location survey143:20
Lucky Thirteen124:32
Prisoners of War143:21
Republican Plot163:36
round-trip connection122:23
Score, The123:22
Sleepcrawler Series131:10, 132:21
Snowball Series125:29
St Giles125:29
War of the Worlds131:10, 132:21
Waterfall Series129:27
Wyvern extensions127:34
Ogof Fawr201:22
Ogof Ffynnon DduAven 2 (OFD 3)278:25
Nant Gam Choke184:15
OFD1 to OFD2 underwater connection135:21
The Smithy and surrounding area247:38
The Wee278:26
Top Entrance to Gnome Passage and surrounding area247:39
 Outline survey of Smithy rescue route284:24
Ogof Ffynnon Taf70:11, 84:14, 139:15
area map84:15
Ogof Foel Fawr86:31
Ogof Glan Gwenlais66:14-15
area map91:22
Ogof Gwynt yr Eira129:34
hydrology129:35
Ogof Igam Ogam83:18
Ogof Marros248:23
Ogof Mynydd Llangynidr114:14
Ogof Nant Hyfryd94:25
Ogof Nant Rhin111:22
Ogof New Park304:29
Ogof O’Flaen-y-Waun117:11
Ogof Pant-y-Llyn60:19
area map91:22
Ogof Pasg86:31
Ogof Pen-y-Craig84:14
Ogof Pwll Swnd88:24
Ogof Pysgodyn Gwyn6:19
Ogof Rhaeadr Ddu63:22
Ogof Swn y Mor277:27
Ogof Triachwech179:23
Ogof yr Uwd Lwyd187:27
Oonaglour143:33
Otter Hole32:23, 56:20-1
Hall of 30113:17
Our Lady’s Cave169:28
Outlands Head Quarry Cave88:16
Ovens Cave144:14
Owl Cave25:11
Owl Hole184:31
access route114:10
Oxlow Cavernsarea map96:12
Crusader Extensions240:32,33, 243:8
hydrology49:39
with Giant’s Hole240:33
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