Largest lakes & reservoirs in Ontario, Canada by acres
There is no widely-accepted minimum surface area that defines a lake. What LakeLubbers describes as a lake, you might call a pond. Acreage of a lake (or sometimes square kilometers) is most often measured at the top surface area when the lake is at normal elevation. The surface area can be considerably smaller or larger when lake levels are lower or higher than normal. North America’s Lake Superior is the world’s largest freshwater lake by this measure.The other measure of a lake’s size is the lake’s water volume. By that measure, the world’s largest freshwater lake is Lake Baikal in Siberia.
You can find many of the world’s largest lakes (acres) on LakeLubbers in the comparison table below. Note: For some lakes, "Largest Lakes - Acres" data is unknown or does not apply, so you may see 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 surface area in acres. 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 | Surface area in acres | Lake description |
---|---|---|
Lake Simcoe, ON (Canada, Ontario, Canada) |
183,846 ac | 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 … |
Lake St. Joseph (Canada, Ontario, Canada) |
121,822 ac | Lake St. Joseph in northwestern Ontario is the kind of lake a fisherman’s dreams are made of. Famous all over North America as a prime fishery for nor … |
Shoal Lake (Canada, Manitoba, Canada, Ontario, Canada) |
80,000 ac | Remote, inviting and beautiful describes Shoal Lake. Sprawling across about 80,000 acres in southwestern Ontario at the border with Manitoba, Shoal La … |
Lake Timiskaming (Canada, Ontario, Canada, Quebec, Canada) |
72,960 ac | Also known as Lake Temiskaming, Lac Temiscamingue Large, scenic and inviting, Lake Timiskaming forms part of the border between Ontario and Quebec. A full 68 miles long, Lake Timiskaming is about 5 mi … |
Kawartha Lakes (Canada, Ontario, Canada) |
67,403 ac | Also known as The Kawarthas The Kawartha Lakes are a band of beautiful lakes in south-central Ontario, Canada that form the upper watershed of the Trent River. Although 14 lakes … |
Lake St. Francis, NY / Canada (Canada, New York, Ontario, Canada, Quebec, Canada, Thousand Islands Region, NY, US Mid-Atlantic Region, USA) |
67,213 ac | Also known as Lac Saint-Francois Lake St. Francis is part of the 2,340 mile system of locks, canals, and channels that link the Atlantic Ocean to the Great Lakes and the St. Lawrence … |
Rice Lake (Canada, Ontario, Canada) |
24,748 ac | Rice Lake is a 24,748-acre lake located in south-eastern Ontario, southeast of the city of Peterborough and north of Cobourg. The beautiful lake is pa … |
Namakan Lake (Canada, Minnesota, Northeast Minnesota, Ontario, Canada, US Midwest Region, USA) |
24,066 ac | Also known as Namakan Reservoir Namakan Lake’s delights await the lucky visitor. Covering more than 24,000 acres with many small islands, about half of the lake is located in Minneso … |
Lake Muskoka, ON (Canada, Ontario, Canada) |
22,091 ac | Also known as Muskoka Lake, Muskoka Lakes Region Lake Muskoka, located in Ontario’s Muskoka Lakes Region, is one of Canada’s most famous lakes. Actually a chain of lakes, Muskoka joins Lake Joseph an … |
Lac des Chats (Canada, Ontario, Canada, Quebec, Canada) |
18,565 ac | Also known as Chats Lake Lac des Chats is more than a ‘wide spot’ on the Ottawa River. Champlain and other explorers remarked on the abundance of catfish along the waterway, s … |
Saganaga Lake, MN / Canada (Canada, Minnesota, Northeast Minnesota, Ontario, Canada, US Midwest Region, USA) |
13,832 ac | The 13,832 acres of Saganaga Lake straddle the border of Northeastern Minnesota and Ontario, Canada. Part of the well known Boundary Waters Canoe Area … |
Lake Couchiching (Canada, Ontario, Canada) |
8,340 ac | 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 … |