Is Ontario a lake or sea?

Lake Ontario is the easternmost Great Lake. It's surrounded by New York and the Canadian province of Ontario. Water flows out out Lake Ontario through the St. Lawrence River on its way to the Atlantic Ocean.



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The Great Lakes could be considered a failed ocean. They are in a place where rifting started to create a new ocean, but it never got connected to the ocean system (and flooded), and that was still the case when the rifting eventually stopped. Those rifts were then further (much later) excavated by glaciers.

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At 1,943 feet (592 meters), Crater Lake is the deepest lake in the United States and one of the deepest in the world. The depths were first explored thoroughly in 1886 by a party from the U.S. Geological Survey.

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While there have been past “sightings,” most have turned out to be pranks or misidentifications. The reality is that the largest of the Great Lakes (Lake Superior and Michigan) are extremely deep lakes that are too cold for sharks.

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The average underwater visibility of Lake Superior is about 8 metres or 27 feet, making it the cleanest and clearest of the Great Lakes.

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For those of you wondering if it is safe to swim in Lake Ontario, Waterkeeper's answer is, Yes! It just depends where and when you want to swim.

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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 reason Lake Ontario stays cold is because it's so deep. The temperature of the lake changes at different depths, which is due to changes in the density of the water. This is called thermal stratification.

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The opposite of Lake Superior in almost every way, Lake Ontario is the easternmost, lowest in elevation, smallest in surface area and perhaps the most polluted Great Lake.

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