Caving Canada Canada’s Longest  Caves Last Update January 2017
Longest
Completely Underwater
Rank Cave Length (m) Depth (m) Province Region Reference 1 Castleguard Cave 21068 384 AB Rockies CC 71 2 Yorkshire Pot 13812 389 AB/BC Rockies CC 3 Weymer Cave System 12739 370 BC Vancouver Island CC 67:26 4 Arch Cave 11039 353 BC Vancouver Island 423 added by Kevin Huntington 2015 5 Ursa Major 8088 190 BC Vancouver Island Martin Davis Nov. 2013 6 Thanksgiving Cave 7588 408 BC Vancouver Island Nick Vieira 2014 7 Three Island Cave 6563 12 QC Ottawa River CC 57:6-8 8 Heavy Breather System 6150 655 BC Rockies CC 63, CC 62:8 9 Gargantua 6001 286 AB/BC Rockies JSM 147:6 10 White Rabbit 5219 459 BC Monashee Mountains Kirk Safford 2016 11 Raspberry Rising 5062 217 BC Rockies Nick Vieira 2017 12 Main Cave (Nakimu) 4500 257 BC Rockies CC-CEC 13 Windy Link Pot 4449 209 BC Vancouver Island Rob Countess 08/2001 14 Bisaro Anima 4322 531 BC Southeast BC Kathleen Graham 2016 15 Rat's Nest Cave 4003 245 AB Rockies UGM 16 Gervais Cave 3907 9 ON/QC Ottawa River CC 29(1):18-23 17 13th Avenue 3698 275 BC Vancouver Island Trevor Moelaert 2015 18 Arctomys Cave 3496 536 BC Rockies CC 16(1):24-26 19 Fang Cave 3342 247 BC Rockies BCC 20 Minigill Cave System 3162 35 BC Vancouver Island Rob Countess 1/2005, BCC 13(1):19 21 Ice Trap 3002 347 AB Rockies Greg Horne 2012 22 Wormhole 2792 93 BC Vancouver Island CC 67:30 23 Cadomin Cave 2791 220 AB Rockies CC 14:19 24 Redemption Cave 2346 199 BC Caribou Mountains JSM 157:4-5 25 Glory 'ole 2340 312 BC Vancouver Island Rob Countess 08/2001 26 Grotte de Boischatel 2300 QC Quebec CC-CEC 27 Resonance Cave 2066 235 BC Vancouver Island Peter Curtis 2015 28 Leopard Frog Cave 1966 25 ON Bruce Peninsula Marcus Buck 3/2001 29 Pellucidar Cave 1943 127 BC Vancouver Island Pat Shaw 8/2002 30 Lost Light System 1930 95 AB Rockies Greg Horne 2008 31 Across the River 1914 5 ON CC 65:9 32 Grotte Valerie 1900 NWT Nahanni CC-CEC 33 Q5 Cave 1867 301 BC Vancouver Island CC 16(1):21 34 Porcupine Cave 1794 100 BC Rockies CC 21(1):36-38 35 Wet Dream (Nomash River Cave) 1726 45 BC  Vancouver Island Peter Norris 2013 36 Dewdney's Caves 1610 4 ON Southern Ontario Marcus Buck 3/2002 37 Reappearing River 1604 49 BC Vancouver Island Rob Countess 1/2005 38 Coral Cave 1455 104 BC Vancouver Island CC-CEC 39 Blak T 1417 89 BC Vancouver Island CC 62:19 40 Hollow Cave 1412 36 BC Vancouver Island Bill Bourdillon, 1/2005 (posthumously) 41 Vanishing Point 1380 99 BC Vancouver Island Peter Curtis 2016 42 Cold Rock To Go 1370 64 BC Vancouver Island CC 21(2):17-25 43 White Hole 1320 253 BC Rockies CC 17:48-73 44 Cody Cave 1308 57 BC Rockies CC 28(1):11-13 45 Big Money Cave 1303 230 BC Vancouver Island CC 62:28 46 Quatsino Cave 1260 152 BC Vancouver Island CC-CEC 47 Moira Cave 1200 13 ON Southern Ontario 48 Maiden Grace 1199 91 BC Vancouver Island BCC 21(3) 49 Marshswallow 1196 82 BC Vancouver Island CC 59:30 50 Solstice Shower Shaft 1191 91 BC Vancouver Island CC 18(2):56-57 51 Callis Cave 1189 ON Southern Ontario James Sled 7/2001 52 Meadow Cave 1135 175 BC Rockies CC 30(1):24-28 53 Long After Dark 1108 89 BC Vancouver Island 54 Mystery Cave 1091 BC Vancouver Island CC 11(1):54 55 Paradise Lost 1090 61 BC Vancouver Island CC 22(1):17-19 56 Cascade Cave 1068 103 BC Vancouver Island CC-CEC 57 Grotte Andrée 1045 NWT Nahanni CC-CEC 58 Dreamtime 1040 58 BC Vancouver Island CC 28(1):36-39 59 Close To The Edge 970 472 BC Rockies CC 58:13 60 Booming Ice Chasm 961 179 AB Rockies Nick Vieira 2013 61 Whistling Cave 919 78 BC Vancouver Island Martin Davis Nov. 2013 62 Over The Hill Cave 913 112 BC Monashee Mountains Kirk Safford 2016 63 Lost Richard 895 47 BC Vancouver Island BCC 25(1):11/12 64 Ptarmigan Cave 890 318 BC Rockies CC 31(1):20-25 65 Foramen Magnum 888 127 BC Vancouver Island Trevor Moelaert 2014 66 Grotte de Saint-Casimir 869 2 QC 67 Tripartight 820 271 BC Rockies CC 62:8 68 Phreatic Follies 809 51 BC Vancouver Island CC 21(2):17-25 69 Moon River Cave 774 142 BC Rockies CC 20(1):7-12 70 Black Hole 740 BC Vancouver Island CC 10(1):8-22 71 Canyon Creek Ice Cave 727 89 AB Rockies CC 8(2):32-36 72 Teawater  Cave 713 52 BC Vancouver Island Trevor Moelaert 11/2003 73 Dezaiko Cave 710 253 BC Rockies CC 18(1):4-10 74 Grueling Cave 697 153 BC Vancouver Island BCC 75 Rockfalls Syphon Cave 692 37 BC Vancouver Island BCC 76 Bath-Gorge Caves 656 25 BC Vancouver Island CC 30(2):42-44 77 Her Majesty's Cave 634 BC Rockies CC 23(1):6-8 78 Bottom's Up 631 78 BC Vancouver Island CC 20(1):36-39 79 Sexy Beast 626 46 BC Rockies CC 66:16 80 Pozu Del Piton 624 59 BC Vancouver Island BCC 9(5):15 81 Larch Valley Cave 611 39 BC Rockies CC 23(1):3-5 82 Pinto Lake Cave 610 123 AB Rockies CC 11(2):19-23 83 Siren Song 608 159 BC Caribou Mountains BCC 26(1) 20/21 84 Spare Change Cave 585 72 BC Vancouver Island Trevor Moelaert 1/2005 85 Skull Creek Cave 584 BC Vancouver Island BCC 86 Gusting Cave 581 53 BC Vancouver Island CC 21(2):17-25 87 F1 Resurgence Cave 570 30 BC Rockies CC 22(1):41 88 Caverne Laflèche 563 31 QC Outaouais CC-CEC 89 Grotte de Lorraine 556 QC Terrebonne CC-CEC 90 Gleason Creek Resurgence 555 28 BC Rockies BCC 8(6):6 91 McRitchie Cavern 549 123 BC Rockies CC 69:20 92 Y2Kave 543 43 BC Vancouver Island BCC 16(1):24 93 Wapiabi Cave 540 152 AB Rockies CC 9(1):25-28 93 Little Moscow 540 96 BC Rockies CC 20(1):3-5 95 Dud Cave 539 37 BC Vancouver Island Trevor Moelaert 1/2006 96 Emelia Creek Main 536 63 BC Vancouver Island 97 Euclataws Cave 530 81 BC Vancouver Island CC-CEC 98 Upana Main 522 19 BC Vancouver Island BCC 26(3):21 99 Maquinna 520 109 BC Vancouver Island VN 100 No Hike Mike 516 105 BC Vancouver Island CC 21(2):19