Are the Great Lakes technically sea?

The United States Environmental Protection Agency, for example, describes them as “vast inland freshwater seas.” A seminal 2017 paper in Limnology and Oceanography, authored by some of the most influential researchers studying the lakes, also refers to them as 'inland seas.



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Why is the Black Sea not a lake? Because it's a part of the global ocean. Its waters are saline, it sits at global sea level, and its connection to the Mediterranean Sea via the Bosporus and Dardanelles at Istanbul is one of the busiest shipping straits on Earth.

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four of the Great Lakes are international waters and are defined as boundary waters in the Boundary Waters Treaty of 1909 between the United States and Canada, and as such any new diversion of Great Lakes water in the United States would affect the relations of the Government of the United States with the Government of ...

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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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The Great Lakes are not (noticeably) salty because water flows into them as well as out of them, carrying away the low concentrations of minerals in the water, writes Michael Moore of Toronto. Eventually, this water, with its small load of dissolved minerals or salts, reaches the sea.

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Geology of Lake Inferior Lake Inferior is an underground lake that is located beneath Lake Superior. It is believed to be formed by a process known as karstification, which is the dissolution of limestone and dolomite rock. This process creates sinkholes, caves, and underground rivers and lakes.

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True tides—changes in water level caused by the gravitational forces of the sun and moon—do occur in a semi-diurnal (twice daily) pattern on the Great Lakes. Studies indicate that the Great Lakes spring tide, the largest tides caused by the combined forces of the sun and moon, is less than five centimeters in height.

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The Welland Canal lock system connects Lake Erie and Lake Ontario, enabling vessels to bypass Niagara Falls. And the St. Lawrence Seaway lock system has tamed the St. Lawrence River, enabling ships to sail from Lake Ontario to the Atlantic Ocean since 1959.

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Most Lakers are subject to unique size constraints that allow them to travel from the Great Lakes waterway through the St. Lawrence Seaway to the Atlantic Ocean. The term 'Seawaymax' refers to the largest vessel size that can fit through the canal locks of the St.

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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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