What state owns Lake Ontario?

Lake Ontario is one of the five Great Lakes of North America. It is bounded on the north, west, and southwest by the Canadian province of Ontario, and on the south and east by the U.S. state of New York. The Canada–United States border spans the centre of the lake.



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6. Lake Michigan is the only Great Lake that is entirely within U.S. territory. The Great Lakes touch 8 states – but Michigan is the only state that touches four lakes, with borders on Superior, Michigan, Huron and Erie.

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The water in the Great Lakes is owned by the general public according to the Public Trust Doctrine. The Public Trust Doctrine is an international legal theory – it applies in both Canada and the United States, so it applies to the entirety of the Great Lakes.

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Millions of people rely on the Great Lakes for their drinking water, which is considered safe if filtered properly. The city of Toronto treats over 1 billion litres of drinking water every day. That water is collected from Lake Ontario through intake pipes deep below the surface and at least 1 km from the shore.

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The lake is located at the border between the United States and Canada, and is shared by the American states of Minnesota, Wisconsin and Michigan and the Canadian province of Ontario.

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It incorporates two countries, eight states, two provinces, Indian tribes and First Nations, American and Canadian international agencies along with many local governments. The Great Lakes are not governed by distinct borders; they include overlapping populations, environments and natural resources.

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Lake Superior is the world's largest freshwater lake by area (31,700 mi2 /82,100 km2). It is also the coldest and deepest of the Great Lakes, with a maximum depth of 406 meters (1,332 feet). By most measures, it is the healthiest of all the Great Lakes.

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Lake Ontario is one of the five Great Lakes of North America. It is bounded on the north, west, and southwest by the Canadian province of Ontario, and on the south and east by the U.S. state of New York. The Canada–United States border spans the centre of the lake.



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The graph below shows the range of monthly Lake Ontario water temperature derived from many years of historical sea surface temperature data. The warmest water temperature is in August with an average around 72.9°F / 22.7°C. The coldest month is March with an average water temperature of 36°F / 2.2°C.

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Lake Ontario may be the most polluted out of the five Great Lakes. All of the other lakes flow into it, giving it their pollution. It also receives runoff from farms and businesses around it, according to the University of Wisconsin Sea Grant Institute.

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Lake Erie is the shallowest and warmest of the Great Lakes.

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Lake Ontario occupies a bedrock depression originally produced by stream erosion and later modified by glaciation. Several glacial lakes of varying elevation occupied the basin before the current level and outlet were established about 11,000 years ago.

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Chicago, on the southern shore of Lake Michigan, is the largest city in the North American Great Lakes region; the metro area has a population of 9.6 million people.

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The lakes provide the backbone for a $6 trillion regional economy that would be one of the largest in the world if it stood alone as a country. Recreation on the Great Lakes – including world-renown boating, hunting and fishing opportunities – generate more than $52 billion annually for the region.

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