Largest lakes & reservoirs in Ontario, Canada by shoreline length
The length of the exterior shoreline around a lake is measured at the lake’s normal elevation. The shoreline length can be considerably shorter or longer when lake water levels are lower or higher than normal. A lake with many coves has a much longer shoreline than a lake of similar surface area that is nearly circular in shape.When known, the shoreline miles that we report in our statistics include only the lake’s exterior shoreline, and exclude the shorelines of islands located within a lake’s boundaries. In lakes with many islands, those islands’ combined shorelines may exceed a lake’s exterior shoreline.
You can find many of the world’s longest-shoreline lakes on LakeLubbers. Note: For some lakes, "Longest Shorelines" data is unknown or does not apply, so this table may display fewer lakes than the total 55 articles we have published for Ontario, Canada lakes.
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Below are lakes within Canada > Ontario, Canada > Compared by longest shoreline length in miles. This list does not represent all lakes in Ontario, Canada, only the 55 Ontario, Canada lake articles we have published on the LakeLubbers website.
Lake name | Shoreline length in miles | Lake description |
---|---|---|
Lake Saint Clair, MI / Canada (Canada, Michigan, Ontario, Canada, Southeast Michigan, US Midwest Region, USA) |
127 mi | Also known as Lake St. Clair Heart-shaped Lake Saint Clair is the smallest body of water in the Great Lakes system. Tucked between Lake Huron to the north and Lake Erie to the sou … |
Bobs and Crow Lakes (Canada, Ontario, Canada) |
123 mi | A perfect destination to savor the character of the Rideau Lake District is Bobs and Crow Lakes. Located 50 miles north of Kingston, Ontario, the two … |
Lake Simcoe, ON (Canada, Ontario, Canada) |
118 mi | Spectacular Lake Simcoe is one of the most visited vacation spots in Ontario’s south-central region. Just over an hour north of Toronto, Lake Simcoe p … |
Charleston Lake (Canada, Ontario, Canada) |
100 mi | A natural haven awaits vacationers in Eastern Ontario along the shores of Charleston Lake. Balanced along the eastern edge of the Frontenac Arch geolo … |
Buckhorn Lake, ON (Canada, Ontario, Canada) |
70 mi | Also known as Trent-Severn Waterway, Kawartha Lakes Part of the Kawartha Chain of Lakes, Buckhorn Lake is one of the many lakes that make up the famed Trent-Severn Waterway. The waterway connects Lake O … |
Trout Lake ON (Canada, Ontario, Canada) |
32 mi | Located in Ontario’s Nipissing District, Trout Lake has everything to offer the northwoods adventurer looking for water-based activities. Often oversh … |
Sand Lake ON (Canada, Ontario, Canada) |
32 mi | Also known as Davis Lake, Rideau Lakes Sand Lake is one of the best-known lakes along the Rideau Waterway in Eastern Ontario. Sand Lake is the location of idyllic Birch Island and home to m … |
Mazinaw Lake (Canada, Ontario, Canada) |
30 mi | Also known as Upper Mazinaw Lake, Lower Mazinaw Lake Amazing Mazinaw Lake holds court as the headwaters of Canada’s Mississippi River in eastern Ontario. This beautiful sprawling lake has alternately del … |
Kennisis Lake (Canada, Ontario, Canada) |
26 mi | A true jewel in the crown of Ontario’s Cottage Country, 3500-acre Kennisis Lake has been the prefect vacation getaway for generations of Canadian cott … |
Upper Rideau Lake (Canada, Ontario, Canada) |
25 mi | Also known as Rideau Lakes Upper Rideau Lake holds a prominent place in Ontario’s ‘other Cottage Country’. Although many think of the area around Lake Muskoka as Eastern Canada’ … |
Otter Lake, ON (Canada, Ontario, Canada) |
24 mi | Also known as Big Otter Lake Otter Lake is a sparkling 1,252-acre lake located near Parry Sound, Ontario, in the Georgian Bay region known as The 30,000 Islands. The Georgian Bay … |
Lake Couchiching (Canada, Ontario, Canada) |
24 mi | Lucky cottagers at Lake Couchiching have the best of all worlds. As a part of the famed Trent-Severn Waterway, Lake Couchiching is the perfect home ba … |