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 |
---|---|---|
Newboro Lake (Canada, Ontario, Canada) |
22 mi | Also known as Mud Lake, Rideau Lakes Newboro Lake, in Ontario’s Rideau Lakes Region is synonymous with water fun. The 4500-acre lake is home to cottages and fishing camps, islands large a … |
Calabogie Lake, ON (Canada, Ontario, Canada) |
19 mi | About 10,000 years ago a glacier retreated across what would become Ontario, leaving over a quarter of a million lakes in its wake. The ice-scour lake … |
Round Lake, ON (Canada, Ontario, Canada) |
19 mi | Round Lake is a spectacular 7,596-acre lake located in Renfrew County, Ontario, Canada. Renfrew County is part of the Ottawa Valley which was carved b … |
Haliburton Lake (Canada, Ontario, Canada) |
19 mi | Haliburton Lake is located in Ontario, Canada in a region called the Haliburton Highlands. The name was given due to the beautiful scenery that resemb … |
Commanda Lake (Canada, Ontario, Canada) |
14 mi | A true jewel in the crown of Ontario’s Near-North vacation playground, Commanda Lake is the perfect spot for either an annual vacation or a seasonal h … |
Wilson Lake, ON (Canada, Ontario, Canada) |
8 mi | Also known as Wauquimakog Lake Ontario visitors who think ‘cottage country’ is limited to the Muskoka Region will miss out on Wilson Lake! Located in Ontario’s ‘near north’, Wilson … |
Indian Lake ON (Canada, Ontario, Canada) |
7 mi | Also known as Rideau Lakes Every North American chain of lakes seems to have an Indian Lake; Ontario’s Rideau Waterway is no exception. The name no doubt came from the original … |
Ferguson Lake, ON (Canada, Ontario, Canada) |
4 mi | Also known as Fergusons Lake, Constos Lake If you’ve ever had a yen for an Ontario Cottage Country vacation without the commercialization and crowds, then Ferguson Lake is for you! Only seven m … |
Troy Lake (Canada, Ontario, Canada) |
4 mi | If you’re looking for a quiet, lakefront cottage vacation, then Troy Lake is for you. Although Troy Lake is not physically connected to the historic R … |
Little Lake (Canada, Ontario, Canada) |
2 mi | When Thoreau wrote about Walden Pond, he obviously didn’t know about Little Lake. For this small lake in Ontario’s Rideau Lakes area could certainly i … |