Largest lakes & reservoirs in Ontario, Canada by water volume
The estimated volume of water that a lake contains is measured at the lake’s normal elevation. By this measure, the world’s largest freshwater lake is Siberia’s Lake Baikal.Water Volume can be measured in acre-feet, in cubic miles, or in cubic kilometers. One acre-foot is the amount of water needed to cover one acre (43,560 square feet) to a depth of one foot. One cubic mile equals 3,379,200 acre-feet. One cubic kilometer equals 810,713 acre-feet. 1 acre-foot is equal to 325,851 US gallons. Siberia’s Lake Baikal contains about 6,276,367,740,000,000 gallons of freshwater – nearly 1 million gallons for every living person on earth.
The other – and more widely used – measure of a lake’s size is the lake’s surface acreage. By that measure, the world’s largest freshwater lake is North America’s Lake Superior.
Note: In the United States, an acre foot is a unit of volume used to refer to large-scale bodies of water. It is defined by the volume of water needed to cover 1 acre of surface area to a depth of 1 foot.
You can find many of the the world’s largest lakes (by water volume) on LakeLubbers. Note: For some lakes, the water volume 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 water volume. 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 | Water vol. in ac-ft | Lake description |
---|---|---|
Lake Nipissing, ON (Canada, Ontario, Canada) |
311,319 ac-ft | 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 … |
Kennisis Lake (Canada, Ontario, Canada) |
270,159 ac-ft | 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 … |
Trout Lake ON (Canada, Ontario, Canada) |
229,189 ac-ft | Located in Ontario’s Nipissing District, Trout Lake has everything to offer the northwoods adventurer looking for water-based activities. Often oversh … |
Haliburton Lake (Canada, Ontario, Canada) |
143,199 ac-ft | 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 … |
Upper Rideau Lake (Canada, Ontario, Canada) |
88,965 ac-ft | (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’ … |
Maple Lake ON (Canada, Ontario, Canada) |
31,999 ac-ft | Maple Lake is a lovely natural freshwater lake tucked away in the Haliburton Highlands of Ontario. This lake has 829 acres of calming blue waters. The … |
Little Kennisis Lake (Canada, Ontario, Canada) |
28,221 ac-ft | Little Kennisis Lake is the smaller counterpart to Kennisis Lake, which is one of the largest lakes in the Haliburton Highlands of Ontario, Canada. Li … |
Lake Opinicon (Canada, Ontario, Canada) |
16,126 ac-ft | (Also known as Rideau Lakes) Opinicon Lake is part of a chain of lakes known as the Rideau Waterway in Ontario, Canada. The lake is connected to others by a canal system called th … |
Benson Lake (Canada, Ontario, Canada) |
4,286 ac-ft | (Also known as Rideau Lakes) Benson Lake is part of the historic Rideau Waterway in Ontario, Canada. Benson Lake is one of six lakes surrounding Scott’s Island. Benson Lake, Clear … |