| WORLDS LONGEST SEA CAVES - July 2015 | ||||||
| LENGTH | ||||||
| Rank | Cave Name | Location | Region | Country | METERS | FEET |
| 1 | Matainaka Cave | Otago | South Island | New Zealand | 1540 | 5052 |
| 2 | Skull Head Cve | Otago | South Island | New Zealand | 1120 | 3675 |
| 3 | Erangi Point Cave | Bethells Beach | North Island | New Zealand | 1040 | 3412 |
| 4 | Noisy Cave | Otago | South Island | New Zealand | 563 | 1847 |
| 5 | Kotau Point Cave | Bethells Beach | North Island | New Zealand | 485 | 1591 |
| 6 | Mercer Bay Cave | Waitakere Reg.Park | Auckland | New Zealand | 470 | 1542 |
| 7 | Gemma"s Cave | Otago | South Island | New Zealand | 421 | 1381 |
| 8 | Lamb of the Lost Cave | Otago | South Island | New Zealand | 407 | 1335 |
| 9 | Pink Cathedral Cave | Otago | South Island | New Zealand | 404 | 1325 |
| 10 | Sea Lion Cave | Oregon | USA | 401 | 1315 | |
| 11 | Luna Caverns | St.Agnes | Cornwall | UK | 380 | 1247 |
| 12 | Painted Cave | Santa Cruz Island | California | USA | 374 | 1227 |
| 13 | Waiahuakua Cave | Kauai | Hawaii | USA | 352 | 1155 |
| 14 | Cueva Tres Pisos | Baja California | California | Mexico | 316 | 1037 |
| 15 | Hol o' Boadie on Papa Stour | Shetland Islands | Scotland | UK | 300 | 984 |
| 16 | Waiwaipuhi Cave | Kauai, Hawaii | Hawaii | USA | 290 | 951 |
| 17 | Puffgin Grotto | Tongass | Alaska | USA | 287 | 942 |
| 18 | Lendingargjogv | Mykinesholmur | Mykines | Faroe Island | 280 | 925 |
| 19 | Sunbeam-by-the-Sea Cave | Punta Banda, Baja | Baja | Mexico | 270 | 886 |
| 20 | Pt. Resistance Cave | Pt. Reyes Nat.Seashore | California | USA | 264 | 867 |
| 21 | Great Fangs Cave | Otago | South Island | New Zealand | 259 | 850 |
| 22 | Puffin Grotto | Noyes Island | Alaska | USA | 247 | 810 |
| 23 | Catacombs Cave | Anacapa Island | California | USA | 246 | 807 |
| 24 | Cathedral Cave | Anacapa Island | California | USA | 241 | 791 |
| 25 | Forbidden Fissures | Santa Cruz County | California | USA | 241 | 791 |
| 26 | Sandside Head Cave #2 | Thurso, Highland | Scotland | UK | 230 | 755 |
| 27 | Sea Maze | San Luis Obispo County | California | USA | 229 | 751 |
| 28 | Waialoha Cave | Kauai, Hawaii | Hawaii | USA | 225 | 738 |
| 29 | Virgin's Spring | Lundy Island, Devon | England | UK | 225 | 738 |
| 30 | Bamboes Gat Guano Cave | Western Cape | South Africa | 215 | 705 | |
| 31 | Drupkelder Cave | Eastern Cape | South Africa | 210 | 689 | |
| 32 | Sand Hill Bluff Cave | Santa Cruz Co. | California | USA | 206 | 676 |
| 33 | Jumbo Gumbo | Santa Rosa Island | California | USA | 205 | 673 |
| 34 | Parallel Tunnels | Punta Banda, Baja | Baja | Mexico | 204 | 669 |
| 35 | Cathedral Cave | Otago | South Island | New Zealand | 199 | 653 |
| 36 | Hols Hellier | Shetland Islands | Scotland | UK | 193 | 633 |
| 37 | Bat Cave | Santa Cruz Island | California | USA | 190 | 623 |
| 38 | Seal Canyon Cave | Santa Cruz Island | California | USA | 189 | 620 |
| 39 | Arch Cave | San Diego County | California | USA | 187 | 614 |
| 40 | Stalactite Cave | Arbroath, Tayside | Scotland | UK | 180 | 591 |
| 41 | Mackinnon's Cave | Isle of Mull, Strathclyde | Scotland | UK | 180 | 591 |
| 42 | Seal's Cave | Lewis, Western Isles | Scotland | UK | 180 | 591 |
| 43 | Keyhole Rock Cave | Anacapa Island | California | USA | 180 | 591 |
| 44 | Three Door Cave | Anacapa Island | California | USA | 180 | 591 |
| 45 | Green Grotto | Santa Cruz Island | California | USA | 180 | 591 |
| 46 | Swiss Surprise Cave | Santa Cruz Island | California | USA | 176 | 577 |
| 47 | Big Mother Cave | Santa Cruz Co. | California | USA | 173 | 568 |
| 48 | Seal Hole Cavern | St.Agnes | Cornwall | UK | 172 | 564 |
| 49 | Dance Hall Cave | Whatipu | West Auckland | New Zealand | 166 | 543 |
| 50 | Shark's Teeth Cave | Santa Cruz Island | California | USA | 158 | 518 |
| 51 | Bixby Landing Cave | Monterey County | California | USA | 158 | 518 |
| 52 | Wolf's lair | Tongass | Alaska | USA | 156 | 510 |
| 53 | Troll Cave | Whatipu | West Auckland | New Zealand | 155 | 509 |
| 54 | Blue Grotto | isle of Kastellorizo | Dodecanese | Greece | 155 | 509 |
| 55 | Riko Riko Cave | Poor Knight Islandas | Northland | New Zealand | 153 | 502 |
| 56 | Bass Rock Cave | North Berwick, Lothian | Scotland | UK | 150 | 492 |
| 57 | Sandside Head Cave #1 | near Thurso, Highland | Scotland | UK | 150 | 492 |
| 58 | Strom Ness | Shetland Islands | Scotland | UK | 150 | 492 |
| 59 | Oumatjie Cave | Western Cape | South Africa | 150 | 492 | |
| 60 | Three Fingers Cave | Anacapa Island | California | USA | 149 | 489 |
| 61 | Cave of the Mists | Santa Cruz Island | California | USA | 149 | 489 |
| 62 | Sarawak Chamber | Santa Cruz County | California | USA | 148 | 486 |
| 63 | Tripple Slot | Western Cape | South Africa | 148 | 486 | |
| 64 | Neptune's Trident East Fork | Santa Cruz Island | California | USA | 145 | 476 |
| 65 | Cave of the Lost Soles | Mendocino County | California | USA | 142 | 466 |
| 66 | Houle de la Banche | Cotes-d'Armor | Bretagne | France | 142 | 466 |
| 67 | Point Buchon Cave | San Luis Obispo Co. | California | USA | 141 | 463 |
| 68 | Half-Gone Cave | Anacapa Island | California | USA | 141 | 463 |
| 69 | Faille de Brezellec | Finistere | Bretagne | France | 140 | 459 |
| 70 | Guano Cave | Eastern Cape | South Africa | 140 | 459 | |
| 71 | Witch's Cauldron | Santa Rosa Island | California | USA | 139 | 456 |
| 72 | Respiring Chimney Cave | Anacapa Island | California | USA | 137 | 449 |
| 73 | Hole of Hellier | Shetland Islands | Scotland | UK | 136 | 446 |
| 74 | Hoiden Hol | Shetland Islands | Scotland | UK | 132 | 433 |
| 75 | Cueva Valdez | Santa Cruz Island | California | USA | 131 | 430 |
| 76 | Geo-na-h-airde | St. Kilda, Western Isles | Scotland | UK | 130 | 427 |
| 77 | Maniniholo Cave | Kauai | Hawaii | USA | 130 | 425 |
| 78 | Cave of the Bird's Eggs | Santa Cruz Island | California | USA | 129 | 423 |
| 79 | Frenchy's Cave | Anacapa Island | California | USA | 129 | 423 |
| 80 | Starfish Cave | Anacapa Island | California | USA | 129 | 423 |
| 81 | Cave of the Harbor Seals | Punta Banda | Baja | Mexico | 128 | 420 |
| 82 | Victory Cave | Anacapa Island | California | USA | 126 | 413 |
| 83 | Long Beach Cave | Otago | Otago | New Zealand | 125 | 410 |
| 84 | Peter's Creek Cove Cave | Mendocino County | California | USA | 125 | 410 |
| 85 | Painted Grotto | Santa Cruz Island | California | USA | 124 | 407 |
| 86 | Double Door Cave | San Luis Obispo Co. | California | USA | 123 | 404 |
| 87 | Shipwreck Cave | Santa Cruz Island | California | USA | 123 | 404 |
| 88 | Seastack Cave | Santa Cruz Island | California | USA | 122 | 400 |
| 89 | Lady's Harbor Cave | Santa Cruz Island | California | USA | 122 | 400 |
| 90 | Owl Cave | Tongass | Alaska | USA | 121 | 397 |
| 91 | Papanikolis | Meganisi, Leucada | Greece | 120 | 394 | |
| 92 | Culzean Castle Cave #3 | near Ayr, Strathclyde | Scotland | UK | 120 | 394 |
| 93 | Rovers' Cave | Tobermory | Ontario | Canada | 120 | 394 |
| 94 | Victor Cave | Whatipu | West Auckland | New Zealand | 120 | 392 |
| 95 | Complex Chasm | Anacapa Island | California | USA | 119 | 390 |
| 96 | Room with many Windows | Punta Banda | Baja | Mexico | 119 | 390 |
| 97 | Pt. Resistance Cave | Marin County | California | USA | 118 | 387 |
| 98 | Natural Bridge Cave | Santa Cruz Island | California | USA | 117 | 384 |
| 99 | La Grieta | Anacapa Island | California | USA | 116 | 381 |
| 100 | Grande grotte du Talut | Morbihan | Bretagne | France | 116 | 381 |
| 101 | Sheep Rock | Shetland Islands | Scotland | UK | 116 | 381 |
| 102 | Brei Holm | Shetland Islands | Scotland | UK | 115 | 377 |
| 103 | Watcomb Bay Cave | Isle of Wight | England | UK | 115 | 377 |
| 104 | Great X Cave | Anacapa Island | California | USA | 113 | 371 |
| 105 | Kalalau Landslide Cave | Kauai | Hawaii | USA | 112 | 367 |
| 106 | Little River Pit | Mendocino County | California | USA | 111 | 365 |
| 107 | Dry Sandy Beach Cave | Santa Cruz Island | California | USA | 111 | 364 |
| 108 | Emerald Cave | isle of Milos | Cyclades | Greece | 110 | 361 |
| 109 | Dickmont's Den Cave | Arbroath, Tayside | Scotland | UK | 110 | 361 |
| 110 | Fast Castle Head Cave | Berwick, Lothian | Scotland | UK | 110 | 361 |
| 111 | Kalalau Beach Cave | Kauai | Hawaii | USA | 110 | 361 |
| 112 | Little Scorpion Bay #2 | Santa Cruz Island | California | USA | 108 | 354 |
| 113 | Smuggler's Cave | San Diego County | California | USA | 108 | 354 |
| 114 | Surging T Cave | Santa Cruz Island | California | USA | 108 | 354 |
| 115 | Collapsing Cave | Anacapa Island | California | USA | 108 | 354 |
| 116 | Outside Tunnel Cave | Anacapa Island | California | USA | 108 | 354 |
| 117 | Cormorant's/Mackinnon's Cave | Isle of Staffa, Strathclyde | Scotland | UK | 107 | 351 |
| 118 | Surfing Tunnel | Santa Cruz County | California | USA | 107 | 351 |
| 119 | Breathing Cave | Santa Cruz Island | California | USA | 106 | 348 |
| 120 | Groot River Guano Cave | Western Cape | South Africa | 105 | 344 | |
| 121 | Cobblestone Cave | Western Cape | South Africa | 105 | 344 | |
| 122 | Starfish Cave | Mendocino County | California | USA | 102 | 335 |
| 123 | Midden Point Cave | Santa Cruz Island | California | USA | 102 | 335 |
| 124 | Cavern Point Cave | Santa Cruz Island | California | USA | 101 | 331 |
| 125 | Pirate's Den | Kauai | Hawaii | USA | 101 | 331 |
| 126 | Uamh Freisgill | Loch Eriboli, Highland | Scotland | UK | 100 | 328 |
| 127 | Flamborough Head Cave #4a | Bridlington, Humberside | England | UK | 100 | 328 |
| 128 | Livermore Head Sea Cave #5 | Torquay, Devon | England | UK | 100 | 328 |
| 129 | Piper's Cave | Tresco, Isles of Scilly | England | UK | 100 | 328 |