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Here are the 32 lakes we have listed within Canada > Ontario - compared by Longest Shorelines.

Note: For some lakes, "Longest Shorelines" is unknown or does not apply, so this comparison may show fewer lakes than you originally selected. Suggest a new lake.

Lake Name Shoreline length in miles Lake Description
Lake of the Woods
(Manitoba, Canada / Ontario, Canada / Minnesota, USA)
25,000 Lake of the Woods Pictures 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 long, 59 miles wide, with 25,000 miles of shoreline - the world's longest lake shoreline. The western part of the lake is mostly open water, while the ...
Lake Michigan-Huron
(Ontario, Canada / Great Lakes / Illinois, USA / Indiana, USA / Michigan, USA / Wisconsin, USA)
5,463 Lake Michigan-Huron Pictures 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 are connected by the five-mile-wide Straits of Mackinac. Hydrologically, this makes these "two lakes" a single lake. Some hydrologists designate the ...
Lake Huron
(Ontario, Canada / Great Lakes / Michigan, USA)
3,825 Lake Huron Pictures 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 incredible 3,825-mile shoreline. The massive lake is the third largest of the Great Lakes by water volume, containing 850 cubic miles of fresh water within ...
Lake Superior
(Ontario, Canada / Great Lakes / Michigan, USA / Minnesota, USA / Wisconsin, USA)
2,726 Lake Superior Pictures Skipping over state and country borders, Lake Superior, the largest, deepest, coldest, cleanest, least developed, and most pristine of the Great Lakes, reigns as the largest freshwater lake in the world by surface area. By volume, this 31,820 square mile colossus ranks fourth - a whopping 2,900 cubic ...
Rainy Lake
(Ontario, Canada / Minnesota, USA)
929 Rainy Lake Pictures Rainy Lake's sprawling 221,000 acres straddle the border of United States and Canada. Known as a water sports lover's paradise, Rainy Lake is located in the Northeastern Region of Minnesota near International Falls and Ranier. Canada's portion of Rainy Lake consists of 75% of this massive body of ...
Lake Erie
(Ontario, Canada / Great Lakes / New York, USA / Pennsylvania, USA / Michigan, USA / Ohio, USA)
871 Lake Erie Pictures Lake Erie, one of the Great Lakes of North America, straddles the borders of Ohio, Pennsylvania, New York, Michigan, and the Canadian province of Ontario. The lake is named after the Native American tribe that inhabited its shores before being killed off by the Iroquois League for aiding their enemy, ...
Lake Ontario
(Ontario, Canada / Great Lakes / New York, USA)
712 Lake Ontario Pictures Lake Ontario, one of the world's five Great Lakes, weaves over state and country borders, delighting Americans, Canadians, and visiting tourists with its deep, clear, clean waters. Proudly home to a staggering 4,700,000 acres (7,340 square miles), Lake Ontario is the smallest of the Great Lakes, the ...
Kawartha Lakes
(Ontario, Canada)
606 Kawartha Lakes Pictures 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 combine to form the famous "Kawarthas," the Kawartha region is home to over 130 lakes. Best known for fishing, the lakes offer a mix of both cold and ...
Lake Nipissing
(Ontario, Canada)
494 Lake Nipissing Pictures Located in the Near North region of Ontario, Lake Nipissing is the fifth largest lake in Ontario excluding the Great Lakes. This relatively shallow 211,200-acre lake is situated between the Ottawa River and Georgian Bay. It drains into Georgian Bay via the French River and with an average depth of only ...
Lake Muskoka
(Ontario, Canada)
177 Lake Muskoka Pictures Also known as: Muskoka Lake, Muskoka Lakes Region
Lake Muskoka, located in Ontario's Muskoka Lakes Region, is arguably Canada's most famous lake. Actually a chain of lakes, Muskoka joins Lake Joseph and Lake Rosseau, along with several smaller lakes, to make up what Canada calls "Cottage Country." The huge chain of rocky-shored lakes contains many ...
Lake Saint Clair
(Ontario, Canada / Michigan, USA)
127 Lake Saint Clair Pictures 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 south, 275,200-acre Lake Saint Clair is conveniently located close to Detroit, Michigan and Windsor, Ontario. Lake Huron to the north flows into the lake ...
Bobs and Crow Lakes
(Ontario, Canada)
123 Bobs and Crow  Lakes Pictures 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 lakes function as water storage for the popular Rideau Canal system. But Bobs and Crow lakes have their own identity separate from the well-known waterway. ...
Lake Simcoe
(Ontario, Canada)
118 Lake Simcoe Pictures 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 provides 287 square miles of water surface and 118 miles of shoreline, guaranteeing plenty of space for every type of water-based amusement visitors could ...
Charleston Lake
(Ontario, Canada)
100 Charleston Lake Pictures A natural haven awaits vacationers in Eastern Ontario along the shores of Charleston Lake. Balanced along the eastern edge of the Frontenac Arch geological formation, Charleston Lake has been the place to go for swimming, boating and fishing for over a hundred years. Charleston Lake has seen visitors ...
Buckhorn Lake
(Ontario, Canada)
70 Also known as: Trent-Severn Waterway, Kawartha Lakes
Two boulders stand a short walk from Bukhorn Lake. Legend says that if two lovers hold hands and each touch one of the boulders they will have a blessed life. Standing between the large rocks known as Adam and Eve with their hands clasped, the young couple stretches fingertips out to touch the cool ...
Sand Lake
(Ontario, Canada)
32 Sand Lake Pictures Also known as: Davis Lake, Rideau Lakes
Sand Lake is likely 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 many, many cottages. The lake was increased in size somewhat by the building of the Jones Falls Dam during construction of the Rideau Canal. A central ...
Trout Lake
(Ontario, Canada)
32 Trout Lake Pictures Located in Ontario's Nipissing District, Trout Lake has everything to offer the northwoods adventurer looking for water-based activities. Often overshadowed by its larger sister Lake Nipissing, Trout Lake offers all of the fishing, frolic and fun that the bigger lake does, just on a bit smaller and ...
Mazinaw Lake
(Ontario, Canada)
30 Mazinaw Lake Pictures 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 delighted and intimidated those who ventured onto its waters for hundreds of years. First Nations tribes spoke in hushed terms of Mishipashoo, legendary ...
Kennisis Lake
(Ontario, Canada)
26 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 cottagers. Located in the area popularly known as the Haliburton Highlands, Kennisis Lake is the largest lake in the region and a vital part of the Trent-Severn ...
Upper Rideau Lake
(Ontario, Canada)
25 Upper Rideau Lake Pictures 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's vacation playground, serious boaters all know about Upper Rideau Lake. A marvel of early 1800s ingenuity, the Rideau Canal is the oldest continuously ...
Lake Couchiching
(Ontario, Canada)
24 Lake Couchiching Pictures 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 base for boating enthusiasts. For fishermen, the large lake offers plenty of angling action. And for those desiring a quiet, water-based retreat, the nearly ...
Otter Lake
(Ontario, Canada)
24 Otter Lake Pictures 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 is 200 miles long by 50 miles wide and covers over 5,800 square miles making it almost as large as Lake Ontario. Local legend tells of a god called Kitchikewana, ...
Newboro Lake
(Ontario, Canada)
22 Newboro Lake Pictures 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 and small, and over 20 miles of wooded shoreline. Although a natural lake, the water level was raised over five feet when the Narrows Lock and Dam was ...
Calabogie Lake
(Ontario, Canada)
19 Calabogie Lake Pictures 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 lakes are too numerous to count, and with so many, it might seem hard for any single lake to stand out. Calabogie Lake in Renfrew County, however, more than ...
Round Lake
(Ontario, Canada)
19 Round Lake Pictures 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 by glaciers some 600 million years ago. Today, Renfrew County sits in the midst of stunning wilderness and gorgeous landscapes. Two provincial parks on ...

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