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 Michigan-Huron (Canada, Chicagoland Region, IL, Great Lakes of North America, Illinois, Indiana, Lake Michigan Region, WI, Michigan, North Indiana, Northeast Michigan, Northwest Michigan, Ontario, Canada, Southwest Michigan, US Midwest Region, USA, Upper Peninsula Region, MI, West Central Michigan, Wisconsin) |
29,062,400 ac | Lake Michigan and Lake Huron – two of North America’s Great Lakes – are contiguous and they share the same elevation of 577 feet above sea level. They… |
| Lake Superior (Canada, Great Lakes of North America, Lake Superior Northwoods Region, WI, Michigan, Minnesota, Northeast Minnesota, Ontario, Canada, US Midwest Region, USA, Upper Peninsula Region, MI, Wisconsin) |
20,288,000 ac | Skipping over state and country borders, Lake Superior, the largest, deepest, coldest, cleanest, least developed, and most pristine of the Great Lakes… |
| Lake Huron (Canada, East Central Michigan, Great Lakes of North America, Michigan, Northeast Michigan, Ontario, Canada, US Midwest Region, USA, Upper Peninsula Region, MI) |
14,726,400 ac | A glacial lake of epic proportions, Lake Huron is the second largest of the five Great Lakes by surface area, boasting 23,010 square miles and an incr… |
| Lake Erie (Canada, Chautauqua-Allegheny Region, NY, Great Lakes Region, PA, Great Lakes of North America, Greater Niagara Region, NY, Michigan, New York, Northeast Ohio, Northwest Ohio, Ohio, Ontario, Canada, Pennsylvania, Southeast Michigan, US Mid-Atlantic Region, US Midwest Region, USA) |
6,261,500 ac | Lake Erie, one of the Great Lakes of North America, straddles the borders of Ohio, Pennsylvania, New York, Michigan, and the Canadian province of Onta… |
| Lake Ontario (Canada, Finger Lakes Region, NY, Great Lakes of North America, Greater Niagara Region, NY, New York, Ontario, Canada, Thousand Islands Region, NY, US Mid-Atlantic Region, USA) |
4,697,600 ac | Lake Ontario, one of the world’s five Great Lakes, weaves over state and country borders, delighting Americans, Canadians, and visiting tourists with… |
| Lake Nipigon, ON (Canada, Ontario, Canada) |
1,198,080 ac | Located in Ontario Canada’s Sunset Country, Lake Nipigon is a destination into a remote area of pristine wilderness and the largest lake entirely with… |
| Lake of the Woods, MN / Canada (Canada, Manitoba, Canada, Minnesota, Northwest Minnesota, Ontario, Canada, US Midwest Region, USA) |
950,400 ac | Spanning the border from Minnesota into the Canadian provinces of Ontario and Manitoba, Lake of the Woods is an enormous body of water over 68 miles l… |
| Lac Seul (Canada, Ontario, Canada) |
409,454 ac | Also known as Lake Seul The second-largest lake entirely within Ontario, Lac Seul has somehow escaped the notice of the casual vacationer looking for a northwoods getaway. Th… |
| Lake Saint Clair, MI / Canada (Canada, Michigan, Ontario, Canada, Southeast Michigan, US Midwest Region, USA) |
275,200 ac | 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… |
| Lake Abitibi (Canada, Ontario, Canada, Quebec, Canada) |
229,760 ac | Nearly 250,000 acres of water delight visitors to Lake Abitibi on the Ontario/Quebec border. This huge lake is actually two lake basins connected by a… |
| Rainy Lake, MN / Canada (Canada, Minnesota, Northeast Minnesota, Ontario, Canada, US Midwest Region, USA) |
221,000 ac | Rainy Lake’s sprawling 221,000 acres straddle the border of the United States and Canada. Known as a water sports lover’s paradise, Rainy Lake is loca… |
| Lake Nipissing, ON (Canada, Ontario, Canada) |
211,201 ac | Located in the Near North region of Ontario, Lake Nipissing is the fifth largest lake in Ontario excluding the Great Lakes. This relatively shallow 21… |