| Saga Hole | | 224:8 |
| Sandford Levvy / Pearl Mine | | 261:26 |
| Sarawak | see Mulu | |
| Sardinia | area map | 94:21 |
| Sa Oche | 94:23 |
| Sa Oche, area map | 94:21 |
| Su Bentu | 94:23 |
| Su Bentu, area map | 94:21 |
| Satire Cave | | 173:10 |
| Saturday Hole | | 9:18 |
| correction to | 10:24 |
| Saudi Arabia | lava fields | 215:31 |
| Scars Hole | | 170:28,29 |
| Schwyll | hydrology | 141:22 |
| Scoska Cave | | 36:20 |
| Ancient Way | 51:11 |
| Seathwaite Lead Mines | | 82:27, 86:23 |
| Sell Gill Holes | | 129:12, 172:21 |
| historical survey | 158:30,31 |
| Sgeinne, Uamh | | 19:16 |
| Sgoltaidh Dhuibe, Uamh na | | 79:18 |
| Shag Cliff | caves of, area map | 119:26 |
| Shakespeare’s Cave | | 85:20-1 |
| Shannon Cave | | 202:33 |
| High-level passages | 256:16, 267:16-17 |
| Sandman’s Layer | 303:15 |
| Shannon Cave/Polltullyard | | 185:33 |
| Shannon Pot | | 209:32-3 |
| Sharks Tooth Cave | | 102:8 |
| Shatter Cave (Mendip) | | 5:18-19, 51:35 |
| Shep Pot | | 230:21 |
| area survey of Leck Fell | 230:24 |
| Notts Permitted Extensions | 232:8 |
| Sherford Cave | | 285:36 |
| Simpson Pot | Storm Pot area | 243:31 |
| Shipham (Mendip) | shaft near | 167:13 |
| Short Long Drop Cave | | 195:12 |
| Shute Shelve Cavern | | 109:31 |
| Shuttleworth Pot | and Witches II | 218:23 |
| Sidetrack Cave | | 169:26 |
| Silver Eye Mine | | 281:10 |
| Sinc-y-Giedd | | 227:8 |
| Singing River Mine | Chocolate Salty Balls Passage | 147:16 |
| Single-Way Mine | | 208:17 |
| Skullcap Cave | | 97:31 |
| Slaughter Stream Cave (Wet Sink) | | 100:27, 142:15 |
| Downstream Sumps | 105:11 |
| Flow Choke Passage | 102:16 |
| hydrology | 100:26 |
| Late for Dinner | 129:30 |
| Long Round Trip | 299:25 |
| The Remelt Plant | 142:14 |
| Three Deserts | 101:11 |
| Sleets Gill Cave | | 106:21 |
| Slieve Elva Pot | | 44:15 |
| Sloping Cave | | 295:8 |
| Slovakia | Stratensk jaskyna | 122:26 |
| Slovenia | Sistem Migovec | 262:31,32,286:20-1,22 |
| Skocjankse jame (3D model) | 268:22 |
| Sistem Primadona | 275:34 |
| Sludge Pit Hole | | 266:41 |
| Smokey Hole | | 57:10,11 |
| Smoo Cave | | 116:21 |
| Smuggler’s Hole | | 119:27 |
| Snaiza Cave | | 146:16 |
| Snow Blindness Cave | | 242:8 |
| Solomon’s Drift | | 64:26 |
| Son of Longcliffe | | 261:35 |
| South Africa | Bushmansgat | 134:29 |
| South Towy Lead Mine | | 271:14 |
| Spain | Aranonera, Sistema | 238:16 |
| Ario Project | 231:35 |
| Azpilicueta, Torca de, link area | 108:16 |
| BigMat Calf Hole, Torca la Vaca | 246:30 |
| BU56 | 48:24-5 |
| BU56 area map | 48:27 |
| Carlista, Torca del: Gran Sala Jon Arana | 245:35 |
| Chicago, Pozu | 198:20-1 |
| Conjurtao, Sistema | 74:21 |
| Cueto, Sima del | 287:21 |
| Culiembro, Cueva | 219:32-3 |
| El Manadero | 159:25 |
| F20 | 74:23 |
| F20, area map | 71:19 |
| Fou de Bor, Sistema de la | 225:35 |
| Fuente Azul | 157:35 |
| GESM, Sistema Sima: Sumps 1 and 2 and surrounding passages | 244:21 |
| Grajera, Torca de la | 287:22 |
| Jorcada Blanca, Pozu | 54:29 |
| Mazuela, Torca de la | 287:24 |
| Muerdago, Torca del (Mistletoe Pot, Site 2081) | 286:30 |
| Nacimiento, Cueva del (Cueva del Agua) | 263:21,22 |
| Picos de Europa, Ortiguero area map | 2:7 |
| Picos de Europa, Picos de Cornión area map | 231:35 |
| Porron, Torca del | 254:25 |
| Pozo Azul | 217:25 |
| Pozo Azul area map | 296:28-29 |
| Renada, Cuevo de la, link area | 108:16 |
| Riano, Cueva de [section of survey used to create 3D model] | 234:36 |
| Silvestre, Cueva de la (T20A) | 270:19,20-21 |
| Tormenta, Pozo | 169:30 |
| Trumbio, Cueva del | 287:19 |
| Yusa, Torca de la | 287:21 |
| Xitu, Pozu del | 49:31 |
| Xitu, Pozu del, area map | 54:26, 67:34 |
| Xitu, Sistema | 231:35, 233:37 |
| see also Canary Islands and Mallorca | |
| Spar Pot | | 57:13, 216:11 |
| Speedwell Cavern | Main Rising | 127:17 |
| Peak Cavern connection area | 118:8 |
| western limits | 127:17 |
| Spider Cave (Derbyshire) | | 114:10 |
| Spider Windypit | | 106:12 |
| Sruh Croppa River Caves | area map | 34:11 |
| St Brendan’s Fissure | | 44:17 |
| St Dunstan’s Well Cave | [incorrectly titled on page] | 19:27 |
| St George’s Cave | | 155:17 |
| Stainsby’s Shaft | | 205:18 |
| Stalactidau Ddu, Ogof | | 232:26 |
| hydrology | 232:27 |
| Stenkrith Cave | | 25:12 |
| Steps Pot | rigging topo | 205:9 |
| Sting Pot | | 149:15 |
| Stock Hill Mine Cave | extensions 2019 | 270:17 |
| Stock’s House Shaft | | 155:16 |
| Stoke Lane Slocker | West London Extension | 25:24 |
| Stone Lever Pot | | 158:11 |
| Stoney Middleton Master Cave | | 285:19,20-1 |
| Storr’s Common | area map | 37:33 |
| Strangle Pot | | 160:34 |
| Strawberry Pot | | 156:12 |
| Streaks Pot | | 97:11 |
| Stukbar Pot | | 187:29 |
| Stump Cross Caverns | | 117:20 |
| Fairy Palace | 162:12 |
| Sunday Mine | | 225:8 |
| Swallet P7 | | 163:11 |
| Swan Dike Pot | | 62:12-13 |
| Swan Mine | Western Series | 182:13 |
| Swildon’s Hole | | 90:21, 194:21 |
| Fault Chamber aven | 36:9 |
| Mud Sump | 168:26 |
| Old Approach area | 64:8 |
| Priddy Green Sink connection | 131:19 |
| Sump 12 | 171:34 |
| Swynne-Puke round-trip | 227:26 |
| Watergate/Paradise Regained | 54:10, 90:23 |
| Swilly Hole | Extension | 101:26 |
| Swindon Hole | | 174:27 |
| Switzerland | Holloch | 69:29, 206:21 |
| JCB Hohle | 21:31 |
| Shelter Pot | 4:23 |
| Siebenhengste-Hohgant-Hohlensystem | 71:29, 81:19, 87:16 |
| Sygun Copper Mine | 3D surface elevation | 167:7 |
