Ontario Lake Depths
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The deepest lakes in our Ontario collection

Ranked by the deepest contour on each lake’s Ontario MNRF bathymetric survey — the deepest line the survey mapped, which can be shallower than the lake’s true deepest point. This ranks only the lakes mapped on this site — some of Ontario’s best-known waters, including Lake Nipigon, Lake of the Woods and Lake Muskoka, have no usable survey here and are simply absent, not smaller or shallower. Lakes that cross a provincial or international border are ranked by the part the Ontario survey maps.

100 lakes

  1. 1Long LakeThunder Bay District167.6 m (550 ft)
  2. 2Mazinaw LakeFrontenac County134.1 m (440 ft)
  3. 3Wanapitei LakeSudbury District124.4 m (408 ft)
  4. 4Ten Mile LakeAlgoma District115.8 m (380 ft)
  5. 5Sandford LakeKenora District109.7 m (360 ft)
  6. 6Winnange LakeKenora District109.7 m (360 ft)
  7. 7Dryberry LakeKenora District103.6 m (340 ft)
  8. 8Quirke LakeAlgoma District102.4 m (336 ft)
  9. 9Dog LakeThunder Bay District100 m (328 ft)
  10. 10Esox LakeRainy River District97.5 m (320 ft)
  11. 11Iroquois BayManitoulin District95 m (312 ft)
  12. 12Lake JosephMuskoka92 m (302 ft)
  13. 13Emerald LakeAlgoma District91.4 m (300 ft)
  14. 14Feist LakeKenora District91.4 m (300 ft)
  15. 15Big Rideau LakeLeeds and Grenville91.4 m (300 ft)
  16. 16Santoy LakeThunder Bay District91.4 m (300 ft)
  17. 17Charleston LakeLeeds and Grenville90 m (295 ft)
  18. 18Lake RosseauMuskoka89 m (292 ft)
  19. 19Smoothwater LakeTimiskaming District88.4 m (290 ft)
  20. 20Cirrus LakeRainy River District88 m (289 ft)
  21. 21Matinenda LakeAlgoma District85.3 m (280 ft)
  22. 22Little Hawk LakeHaliburton County85.3 m (280 ft)
  23. 23Anishinabi LakeKenora District85.3 m (280 ft)
  24. 24Gordon LakeKenora District85.3 m (280 ft)
  25. 25Bark LakeRenfrew County85.3 m (280 ft)
  26. 26Kahshahpiwi LakeRainy River District84 m (276 ft)
  27. 27Silver LakeKenora District82.3 m (270 ft)
  28. 28Redstone LakeHaliburton County80.5 m (264 ft)
  29. 29Ouellette LakeAlgoma District80 m (262 ft)
  30. 30Sutton LakeKenora District80 m (262 ft)
  31. 31McLaurin LakeThunder Bay District80 m (262 ft)
  32. 32Agnes LakeRainy River District79.2 m (260 ft)
  33. 33Lauzon LakeAlgoma District79 m (259 ft)
  34. 34Jean LakeRainy River District78 m (256 ft)
  35. 35Fishnet LakeThunder Bay District78 m (256 ft)
  36. 36Heron LakeRainy River District77 m (253 ft)
  37. 37Delaney LakeKenora District76.2 m (250 ft)
  38. 38Katimiagamak LakeKenora District76.2 m (250 ft)
  39. 39Missinaibi LakeSudbury District76.2 m (250 ft)
  40. 40Burns LakeAlgoma District76 m (249 ft)
  41. 41Skeleton LakeMuskoka75 m (246 ft)
  42. 42Kawagama LakeHaliburton County75 m (246 ft)
  43. 43Wakomata LakeAlgoma District73.2 m (240 ft)
  44. 44Basswood LakeAlgoma District73.2 m (240 ft)
  45. 45Ranger LakeAlgoma District73.2 m (240 ft)
  46. 46Kennisis LakeHaliburton County73.2 m (240 ft)
  47. 47Halls LakeHaliburton County73 m (240 ft)
  48. 48Lawrence LakeKenora District73.2 m (240 ft)
  49. 49Daniel LakeKenora District73.2 m (240 ft)
  50. 50Linklater LakeKenora District73.2 m (240 ft)
  51. 51Louisa LakeRainy River District73.2 m (240 ft)
  52. 52Burchell LakeThunder Bay District73.2 m (240 ft)
  53. 53Anima Nipissing LakeTimiskaming District73.2 m (240 ft)
  54. 54Ogoki ReservoirThunder Bay District72 m (236 ft)
  55. 55Deep LakeThunder Bay District72 m (236 ft)
  56. 56Flack LakeAlgoma District70.1 m (230 ft)
  57. 57Five Pines LakeCochrane District70 m (230 ft)
  58. 58Fairy LakeMuskoka70 m (230 ft)
  59. 59Lake NipissingNipissing District70 m (230 ft)
  60. 60Poohbah LakeRainy River District70 m (230 ft)
  61. 61Burt LakeRainy River District70 m (230 ft)
  62. 62Beagle LakeThunder Bay District70 m (230 ft)
  63. 63Dog LakeAlgoma District68.6 m (225 ft)
  64. 64Kirkpatrick LakeAlgoma District67.1 m (220 ft)
  65. 65Desert LakeFrontenac County67.1 m (220 ft)
  66. 66Mather LakeKenora District67 m (220 ft)
  67. 67Aylen LakeNipissing District67.1 m (220 ft)
  68. 68Trout LakeNipissing District67.1 m (220 ft)
  69. 69Clearwater West LakeRainy River District67.1 m (220 ft)
  70. 70Mesomikenda LakeSudbury District67.1 m (220 ft)
  71. 71Obonga LakeThunder Bay District67.1 m (220 ft)
  72. 72Chiblow LakeAlgoma District66.9 m (219 ft)
  73. 73Deer LakeKenora District66 m (217 ft)
  74. 74Lukinto LakeThunder Bay District65.8 m (216 ft)
  75. 75Kimball LakeHaliburton County64 m (210 ft)
  76. 76Beaverhouse LakeRainy River District64 m (210 ft)
  77. 77Muskrat LakeRenfrew County64 m (210 ft)
  78. 78Mishi LakeThunder Bay District64 m (210 ft)
  79. 79Cobre LakeAlgoma District61.6 m (202 ft)
  80. 80Rawhide LakeAlgoma District61 m (200 ft)
  81. 81Mashagama LakeAlgoma District61 m (200 ft)
  82. 82Dollyberry LakeAlgoma District61 m (200 ft)
  83. 83Sesabic LakeAlgoma District61 m (200 ft)
  84. 84Lake of BaysMuskoka61 m (200 ft)
  85. 85Boshkung LakeHaliburton County61 m (200 ft)
  86. 86Conifer LakeKenora District61 m (200 ft)
  87. 87McCraney LakeNipissing District61 m (200 ft)
  88. 88Vista LakeRainy River District61 m (200 ft)
  89. 89Cairngorm LakeThunder Bay District61 m (200 ft)
  90. 90Bob LakeHaliburton County60 m (197 ft)
  91. 91Goshawk LakeKenora District60 m (197 ft)
  92. 92Little Round LakeKenora District60 m (197 ft)
  93. 93Granite LakeKenora District60 m (197 ft)
  94. 94Trout LakeSudbury District60 m (197 ft)
  95. 95Nameiben LakeThunder Bay District60 m (197 ft)
  96. 96Bigwood LakeSudbury District58.5 m (192 ft)
  97. 97Mary LakeMuskoka58 m (190 ft)
  98. 98Big Clear LakeFrontenac County57.9 m (190 ft)
  99. 99Blackstone LakeParry Sound District57.9 m (190 ft)
  100. 100Chipman LakeCochrane District56.1 m (184 ft)
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