Longest caves
| Rank | Cave Name | Length (km) | Vertical Range (m) | Region | Type | More Info |
|---|---|---|---|---|---|---|
| 1 | Three Counties System | 87 | 253 | Northern Dales | All cave | Short description |
| 2 | Ogof Draenen | 70 | 151 | South Wales | All cave | Short description |
| 3 | Ogof Ffynnon Ddu | 50 | 308 | South Wales | All cave | Short description |
| 4 | Agen Allwedd | 32.5 | 160 | South Wales | All cave | Short description |
| 5 | Ogof Daren Cilau System | 28 | 232 | South Wales | All cave | Short description |
| 6 | Kingsdale Master Cave | 27 | 165 | Northern Dales | All cave | Short description |
| 7 | Clearwell Caves | 24 | 107 | Forest Of Dean | Part mine | Short description |
| 8 | Peak Cavern - Speedwell Cavern | 17.59 | 248 | Peak District | Part mine | Short description |
| 9 | Gaping Gill System | 16.9 | 197.5 | Northern Dales | All cave | Short description |
| 10 | Dan-Yr-Ogof | 16 | 150 | South Wales | All cave | Short description |
| 11 | Poulnagollum - Poulelva | 16 | 140 | Co. Clare | All cave | Short description |
| 12 | Slaughter Stream Cave | 14 | 100 | Forest Of Dean | All cave | Short description |
| 13 | Marble Arch - Upper Cradle - Lower Cradle - Prod's Pot - Cascades Rising | 11.5 | < 60 | Co. Fermanagh | All cave | |
| 14 | Mossdale Caverns | 10.5 | 60 | Northern Dales | All cave | Short description |
| 15 | Doolin Cave | 10.5 | < 60 | Co. Clare | All cave | Short description |
| 16 | Lancliffe Pot | 9.6 | 116 | Northern Dales | All cave | |
| 17 | Swildon's Hole | 9.41 | 167 | Mendip | All cave | Short description |
| 18 | Carno | 8.9 | 63 | South Wales | All cave | Short description |
| 19 | Little Neath River Cave | 8.8 | 125 | South Wales | All cave | Short description |
| 20 | Ogof Craig A Ffynnon | 8 | 115 | South Wales | All cave | Short description |
| 21 | Cullaun Five | 7.2 | < 60 | Co. Clare | All cave | |
| 22 | The Goyden System | 7.1 | < 60 | Northern Dales | All cave | Short description |
| 23 | Gingling Hole | 6.9 | 177 | Northern Dales | All cave | Short description |
| 24 | Reyfad - Pollnacrom - Polltullybrack | 6.7 | 193 | Co. Fermanagh | All cave | Short description |
| 25 | St. Cuthbert's Swallet | 6.7 | 145 | Mendip | All cave | Short description |
| 26 | White Scar Cave | 6.5 | < 60 | Northern Dales | All cave | |
| 27 | Mongo Gill Hole - Stump Cross Caverns | 5.8 | < 60 | Northern Dales | All cave | Short description |
| 28 | Coolagh River Cave | 5.285 | 72 | Co. Clare | All cave | |
| 29 | Penyghent Pot | 5.2 | 196 | Northern Dales | All cave | Short description |
| 30 | Poulnagree | 5.2 | 130 | Co. Clare | All cave | |
| 31 | Shannon Cave - Polltullyard | 5 | 130 | Co. Fermanagh | All cave | Short description |
| 32 | Dale Barn Cave | 4.9 | < 60 | Northern Dales | All cave | |
| 33 | Charterhouse Cave | 4.868 | 228 | Mendip | All cave | |
| 34 | Giants Hole - Oxlow Caverns | 4.8 | 211 | Peak District | Part mine | Short description |
| 35 | Meregill - Roaring Hole | 4.6 | 181 | Northern Dales | All cave | Short description |
| 36 | Magnetometer Pot | 4.6 | 91 | Northern Dales | All cave | |
| 37 | Knock Fell Caverns | 4.5 | < 60 | Northern Dales | All cave | |
| 38 | Red Moss/Birkwith System | 4.2 | < 60 | Northern Dales | All cave | |
| 39 | Ogof Llyn Parc | 4 | 110 | North Wales | Part mine | |
| 40 | Miss Graces Lane Swallet | 4 | 72 | Forest Of Dean | All cave | Short description |
| 41 | Dub Cote Cave | 4 | < 60 | Northern Dales | All cave | |
| 42 | The Dark Shamrock Traverse - Pollaloughabo - Pollbehan - Moran's Cave | 4 | < 60 | Co. Galway | All cave | Short description |
| 43 | Crag Cave | 3.81 | < 60 | Co. Kerry | All cave | Short description |
| 44 | Noon's Hole - Arch Cave | 3.7 | 108 | Co. Fermanagh | All cave | |
| 45 | Dow Cave - Providence Pot | 3.7 | < 60 | Northern Dales | All cave | Short description |
| 46 | Wookey Hole | 3.66 | 182 | Mendip | All cave | Short description |
| 47 | Baker's Pit - Reeds | 3.631 | < 60 | Devon | All cave | Short description |
| 48 | Upper Flood Swallet | 3.615 | 128 | Mendip | All cave | Short description |
| 49 | Birks Fell Cave | 3.6 | 142 | Northern Dales | All cave | |
| 50 | Fergus River Cave | 3.6 | < 60 | Co. Clare | All cave | |
| 51 | Cullaun Three | 3.5 | 78 | Co. Clare | All cave | Short description |
| 52 | Otter Hole | 3.352 | < 60 | South Wales | All cave | Short description |
| 53 | Cullaun Two | 3.335 | < 60 | Co. Clare | All cave | |
| 54 | Carlswark Cavern | 3.243 | 61 | Peak District | Part mine | Short description |
| 55 | Fairy Holes | 3.2 | < 60 | Northern Dales | All cave | |
| 56 | Poll-Cahercloggaun West-One | 3.17 | < 60 | Co. Clare | All cave | |
| 57 | Pollaraftra | 3.13 | 73 | Co. Fermanagh | All cave | |
| 58 | Boreham Cave | 3.1 | < 60 | Northern Dales | All cave | Short description |
| 59 | Cullaun One | 3.1 | < 60 | Co. Clare | All cave | |
| 60 | Bagshawe Cavern | 3 | < 60 | Peak District | All cave | Short description |
| 61 | Uamh An Claonaite | 2.868 | 110 | Assynt | All cave | Short description |
| 62 | Ibbeth Peril - Upper Hackergill Caves | 2.803 | < 60 | Northern Dales | All cave | Short description |
| 63 | Eastwater Cavern | 2.8 | 160 | Mendip | All cave | Short description |
| 64 | Knotlow Cavern | 2.6 | 76 | Peak District | Part mine | Short description |
| 65 | Lathkill Head Cave - Ricklow Cave | 2.58 | < 60 | Peak District | All cave | Short description |
| 66 | Mitchelstown New Cave | 2.54 | < 60 | Co. Tipperary | All cave | Short description |
| 67 | Porth yr Ogof | 2.53 | < 60 | South Wales | All cave | Short description |
| 68 | Boho Caves | 2.5 | < 60 | Co. Fermanagh | All cave | Short description |
| 69 | Cloyne Cave | 2.5 | < 60 | Co. Cork | All cave | Short description |
| 70 | Ogof T1 | 2.5 | < 60 | South Wales | All cave | Short description |
| 71 | Alum Pot System | 2.454 | 129 | Northern Dales | All cave | Short description |
| 72 | Aygill Caverns | 2.438 | < 60 | Northern Dales | All cave | Short description |
| 73 | Sleets Gill Cave | 2.4 | 76 | Northern Dales | All cave | Short description |
| 74 | Polltoophill - Polldeelin | 2.4 | 62 | Co. Galway | All cave | |
| 75 | Hurtle Pot - Jingle Pot System | 2.37 | 64 | Northern Dales | All cave | |
| 76 | Gragan West Cave | 2.255 | < 60 | Co. Clare | All cave | |
| 77 | Robinsons' Pot | 2.2 | < 60 | Northern Dales | All cave | |
| 78 | Stoke Lane Slocker | 2.18 | < 60 | Mendip | All cave | Short description |
| 79 | Tunnel Cave | 2.135 | 145 | South Wales | All cave | Short description |
| 80 | Gough's Cave | 2.135 | 90 | Mendip | All cave | Short description |
| 81 | Polldubh | 2.13 | < 60 | Co. Clare | All cave | |
| 82 | Black Keld | 2.115 | < 60 | Northern Dales | All cave | |
| 83 | Pollballiny | 2.065 | 80 | Co. Clare | All cave | |
| 84 | Moran's Cave | 2.055 | < 60 | Co. Galway | All cave | |
| 85 | Ogof Hesp Alyn | 2 | 97 | North Wales | All cave | Short description |
| 86 | Cliff Force Cave | 2 | < 60 | Northern Dales | All cave | |
| 87 | Poulawillin | 2 | < 60 | Co. Clare | All cave | |
| 88 | GB Cave | 1.95 | 134 | Mendip | All cave | Short description |
| 89 | Dog Hole - Crystal Cave | 1.95 | < 60 | Northern Dales | All cave | |
| 90 | Poultalloon | 1.91 | < 60 | Co. Clare | All cave | |
| 91 | Aille River Cave | 1.9 | < 60 | Co. Mayo | All cave | Short description |
| 92 | Smeltmill Beck Cave | 1.9 | < 60 | Northern Dales | All cave | |
| 93 | P8 (Jackpot) | 1.8 | 70 | Peak District | All cave | Short description |
| 94 | Blea Gill Cave | 1.8 | < 60 | Northern Dales | All cave | |
| 95 | Poll Cahermacnaghten | 1.8 | < 60 | Co. Clare | All cave | |
| 96 | Devis Hole Mine Caves - South and East Cave Series | 1.791 | < 60 | Northern Dales | Part mine | Short description |
| 97 | Joint Hole | 1.77 | < 60 | Northern Dales | All cave | |
| 98 | Ogof Llyn Ddu | 1.77 | < 60 | North Wales | All cave | |
| 99 | Ogof Afon Hepste | 1.76 | < 60 | South Wales | All cave | Short description |
| 100 | Doonyvardan Cave | 1.74 | < 60 | Co. Clare | All cave | |
| 101 | Polskeheenarinky | 1.74 | < 60 | Co. Tipperary | All cave | |
| 102 | Llanelly Quarry Pot | 1.705 | 80 | South Wales | All cave | Short description |
| 103 | Ayleburn Mine Cave | 1.7 | < 60 | Northern Dales | All cave | |
| 104 | Devis Hole Mine Caves - Central Maze | 1.7 | < 60 | Northern Dales | All cave | |
| 105 | Faunarooska Cave | 1.69 | 94 | Co. Clare | All cave | |
| 106 | Great Douk Cave | 1.676 | < 60 | Northern Dales | All cave | |
| 107 | Longwood Swallet | 1.65 | 175 | Mendip | All cave | Short description |
| 108 | Redhouse Lane Swallet | 1.615 | < 60 | Forest Of Dean | All cave | Short description |
| 109 | Redmire Pot | 1.6 | 117 | Northern Dales | All cave | |
| 110 | Llygad Llwchwr | 1.6 | < 60 | South Wales | All cave | Short description |
| 111 | Mermaid's Hole (Green Holes of Doolin) | 1.6 | < 60 | Co. Clare | All cave | Short description |
| 112 | Spittle Croft Cave | 1.6 | < 60 | Northern Dales | All cave | Short description |
| 113 | Excalibur Pot | 1.573 | < 60 | North York | All cave | Short description |
| 114 | Goatchurch Cavern | 1.532 | 63 | Mendip | All cave | Short description |
| 115 | Tooth Cave | 1.525 | < 60 | South Wales | All cave | Short description |
| 116 | Long Kin East - Rift Pot | 1.5 | 113 | Northern Dales | All cave | |
| 117 | Small Polldeelin (Poulnacapple) | 1.5 | 71 | Co. Galway | All cave | |
| 118 | Tullyhona Rising Cave | 1.5 | 65 | Co. Fermanagh | All cave | |
| 119 | Aillwee Cave | 1.5 | < 60 | Co. Clare | All cave | Short description |
| 120 | Allt Nan Uamh Stream Cave | 1.5 | < 60 | Assynt | All cave | Short description |
| 121 | Ogof Cynnes | 1.5 | < 60 | South Wales | All cave | Short description |
| 122 | Ogof Tarddiad Rhymney | 1.5 | < 60 | South Wales | All cave | Short description |
| 123 | Pollnagossan (Pollnadossan) | 1.5 | < 60 | Co. Cavan | All cave | |
| 124 | Scoska Cave | 1.5 | < 60 | Northern Dales | All cave | |
| 125 | Borrins Moor Cave | 1.433 | 108 | Northern Dales | All cave | |
| 126 | Thrupe Lane Swallet | 1.417 | 120 | Mendip | All cave | Short description |
| 127 | Cnoc Nan Uamh | 1.4 | 84 | Assynt | All cave | Short description |
| 128 | Shatter Cave | 1.373 | < 60 | Mendip | All cave | Short description |
| 129 | Eglwys Faen | 1.34 | < 60 | South Wales | All cave | Short description |
| 130 | Blue John Caverns | 1.324 | 90 | Peak District | Part mine | |
| 131 | Ballyglunin Cave | 1.3 | < 60 | Co. Galway | All cave | Short description |
| 132 | Tyning's Barrow Swallet | 1.28 | 132 | Mendip | All cave | |
| 133 | Eglin's Hole | 1.28 | < 60 | Northern Dales | All cave | |
| 134 | Marble Steps Pot | 1.273 | 131 | Northern Dales | All cave | |
| 135 | Tatham Wife Hole | 1.219 | 155 | Northern Dales | All cave | |
| 136 | Big Sink Cave (or swallet) | 1.2 | 126 | Forest Of Dean | All cave | Short description |
| 137 | Pant Mawr Pot | 1.2 | 97 | South Wales | All cave | Short description |
| 138 | Bown Scar Cave | 1.2 | < 60 | Northern Dales | All cave | |
| 139 | Cherry Tree Hole | 1.2 | < 60 | Northern Dales | All cave | |
| 140 | Hagg Gill Pot | 1.2 | < 60 | Northern Dales | All cave | Short description |
| 141 | Windegg Mine Caverns | 1.2 | < 60 | Northern Dales | All cave | |
| 142 | Manor Farm Swallet | 1.17 | 162 | Mendip | All cave | Short description |
| 143 | Fairy Cave - Hillier's Cave - Hillwithy Cave | 1.17 | < 60 | Mendip | All cave | Short description |
| 144 | Crescent Pot | 1.146 | 122 | Northern Dales | All cave | |
| 145 | Wigmore Swallet | 1.125 | 110 | Mendip | All cave | |
| 146 | Ogof Rhyd Sych | 1.11 | < 60 | South Wales | All cave | Short description |
| 147 | Langstroth Pot | 1.1 | 90 | Northern Dales | All cave | |
| 148 | Ogof Fawr | 1.1 | 76 | South Wales | All cave | Short description |
| 149 | Grabbers Cave | 1.1 | < 60 | Northern Dales | All cave | |
| 150 | Hugh's Moss Cave | 1.1 | < 60 | Northern Dales | All cave | |
| 151 | Pridhamsleigh Cavern | 1.1 | < 60 | Devon | All cave | |
| 152 | Yew Cogar Cave | 1.1 | < 60 | Northern Dales | All cave | |
| 153 | Little Hull Pot | 1.097 | 110 | Northern Dales | All cave | |
| 154 | Heron Pot | 1.097 | < 60 | Northern Dales | All cave | Short description |
| 155 | Ogof Pwll Swnd | 1.075 | 76 | South Wales | All cave | |
| 156 | Dry Gill Cave | 1.07 | < 60 | Northern Dales | All cave | |
| 157 | Ogof Fechan | 1.067 | < 60 | South Wales | All cave | Short description |
| 158 | Lower Cales Dale Cave | 1.055 | < 60 | Peak District | All cave | |
| 159 | Malham Cove Risings | 1.055 | < 60 | Northern Dales | All cave | Short description |
| 160 | Pikedaw Calamine Caverns | 1.055 | < 60 | Northern Dales | Part mine | Short description |
| 161 | Hammer Pot | 1.036 | 90 | Northern Dales | All cave | |
| 162 | Creevy Cave | 1.024 | < 60 | Co. Monaghan | All cave | Short description |
| 163 | Ogof Ap Robert | 1.015 | 90 | South Wales | All cave | Short description |
| 164 | Pollnaindre | 1 | 82 | Co. Galway | All cave | |
| 165 | Ballynallia Cave | 1 | < 60 | Co. Kerry | All cave | |
| 166 | Barras End Mine Caverns | 1 | < 60 | Northern Dales | All cave | |
| 167 | Bullock Pot | 1 | < 60 | Co. Clare | All cave | Short description |
| 168 | Carrickbeg Rising Cave (Bunty Pot) | 1 | < 60 | Co. Fermanagh | All cave | |
| 169 | Kent's Cavern | 1 | < 60 | Devon | All cave | Short description |
| 170 | Nidd Head North West Rising | 1 | < 60 | Northern Dales | All cave | |
| 171 | Ogof-Yr-Ardd | 1 | < 60 | South Wales | All cave | Short description |
| 172 | Poll-Cahermaan | 1 | < 60 | Co. Clare | All cave | |
| 173 | Skirwith Cave | 1 | < 60 | Northern Dales | All cave | |
| 174 | Tub Hole | 1 | < 60 | Northern Dales | All cave |
Total cave length (for caves of 1 km and above): 835.905 km.
If you don't see the cave you want, but you know it should be in the all regions section, remember that this list only shows caves with at least 1 km length of natural passage. Other caves may show up in the list of deepest caves in all regions.
However, if you are looking for a specific cave that does have at least 1 km length of natural passage, and should be listed here, please let me know about it so I can update the database.