Deepest Lakes in Ontario

Of the 2,688 Ontario lakes with a depth survey, the deepest is Long Lake at 168 m. Half reach less than 15 m, and 155 reach 50 m or more.

Distribution

Number of lakes in each range (m), out of 2,688.

How this is measured

Maximum depth is the deepest contour or sounding in each lake’s provincial bathymetric survey (Ontario Ministry of Natural Resources lake bathymetry; Quebec Ministère de l’Environnement bathymetric surveys). Only surveyed lakes are ranked, so a deep lake that was never surveyed is missing. Old surveys can miss the deepest hole. The Great Lakes are left out.

Data as of October 9, 2026.

Lake with a full profile (magenta: top 10)Other lake

Top 100

#	Lake	Max depth m	Area km²
1	Long LakeThunder Bay	168	136
2	Upper Mazinaw LakeLennox and Addington	134	12.2
3	Wanapitei LakeGreater Sudbury / Grand Sudbury	124	133
4	Ten Mile LakeAlgoma	116	10.4
5	Winnange LakeKenora	110	24.5
6	Sandford LakeKenora	110	29.3
7	Dryberry LakeKenora	104	96
8	Quirke LakeAlgoma	102	20.7
9	Dog LakeThunder Bay	100	144
10	Esox LakeRainy River	98	11.9
11	Lake JosephMuskoka	92	53.8
12	Manitowik LakeAlgoma	91	27.1
13	Emerald LakeAlgoma	91	4.33
14	Feist LakeKenora	91	4.86
15	Santoy LakeThunder Bay	91	9.98
16	Big Rideau LakeLanark	91	48.1
17	Charleston LakeLeeds and Grenville	90	26.9
18	Lake RosseauMuskoka	89	65.7
19	Smoothwater LakeTimiskaming	88	9.18
20	Cirrus LakeRainy River	88	22.2
21	Little Hawk LakeHaliburton	85	3.65
22	Gordon LakeKenora	85	8.88
23	Anishinabi LakeKenora	85	32.9
24	Matinenda LakeAlgoma	85	41.5
25	Bark LakeRenfrew	85	43.7
26	Kahshahpiwi LakeRainy River	84	5.55
27	Silver LakeKenora	82	25.9
28	Redstone LakeHaliburton	81	12.2
29	Ouellette LakeAlgoma	80	1.66
30	McLaurin LakeThunder Bay	80	3.03
31	Sutton LakeKenora	80	36.9
32	Agnes LakeRainy River	79	30.1
33	Sturgeon LakeThunder Bay	79	243
34	Lauzon LakeAlgoma	79	22.1
35	Fishnet LakeThunder Bay	78	0.46
36	Jean LakeRainy River	78	13.6
37	Heron LakeRainy River	77	5.87
38	Katimiagamak LakeKenora	76	11
39	Delaney LakeKenora	76	12.9
40	Missinaibi LakeSudbury	76	81.8
41	Burns LakeAlgoma	76	1.68
42	Skeleton LakeMuskoka	75	20.7
43	Kawagama LakeHaliburton	75	31.6
44	Linklater LakeKenora	73	6.33
45	Louisa LakeRainy River	73	7.25
46	Burchell LakeThunder Bay	73	10.5
47	Kennisis LakeHaliburton	73	15
48	Daniels LakeKenora	73	16.4
49	Anima Nipissing LakeTimiskaming	73	20.6
50	Lawrence LakeKenora	73	20.6
51	Ranger LakeAlgoma	73	23.2
52	Wakomata LakeAlgoma	73	24.8
53	Basswood LakeAlgoma	73	27
54	Lake TemagamiNipissing	73	240
55	Halls LakeHaliburton	73	5.33
56	Ogoki ReservoirThunder Bay	72	131
57	Deep LakeThunder Bay	72	0.45
58	Flack LakeAlgoma	70	9.45
59	Five Pines LakeCochrane	70	0.38
60	Beagle LakeThunder Bay	70	1.7
61	Fairy LakeMuskoka	70	7.08
62	Burt LakeRainy River	70	7.39
63	Poohbah LakeRainy River	70	15.5
64	Lake NipissingNipissing	70	856
65	Dog LakeAlgoma	69	53.3
66	Desert LakeFrontenac	67	3.83
67	Kirkpatrick LakeAlgoma	67	11.2
68	Trout LakeNipissing	67	19.4
69	Aylen LakeNipissing	67	21.2
70	Mesomikenda LakeSudbury	67	24.5
71	Clearwater West LakeRainy River	67	36.1
72	Obonga LakeThunder Bay	67	37.4
73	Mather LakeKenora	67	4.42
74	Chiblow LakeAlgoma	67	20.5
75	Deer LakeKenora	66	152
76	Lukinto LakeThunder Bay	66	3.77
77	Kimball LakeHaliburton	64	2.17
78	Mishi LakeThunder Bay	64	2.17
79	Champlain Trail LakesRenfrew	64	15
80	Beaverhouse LakeRainy River	64	19.7
81	Cobre LakeAlgoma	62	0.91
82	Sesabic LakeAlgoma	61	1.48
83	Gould LakeFrontenac	61	2.11
84	Dollyberry LakeAlgoma	61	2.3
85	McCraney LakeNipissing	61	4.5
86	Vista LakeRainy River	61	5.66
87	Mashagama LakeAlgoma	61	6.78
88	Cairngorm LakeThunder Bay	61	7.07
89	Boshkung LakeHaliburton	61	7.18
90	Papineau LakeHastings	61	8.41
91	Rawhide LakeAlgoma	61	9.56
92	Conifer LakeKenora	61	11.4
93	Lake of BaysMuskoka	61	67.7
94	Goshawk LakeKenora	60	20.8
95	Nameiben LakeThunder Bay	60	1.21
96	Granite LakeKenora	60	1.37
97	Bob LakeHaliburton	60	2.35
98	Trout LakeSudbury	60	9.49
99	Bigwood LakeSudbury	59	2.79
100	Mary LakeMuskoka	58	10.7

Other rankings

Clearest lakes868
Largest lakes18,731