The St.Lawrence Seaway extends from Montreal to Lake Erie and includes the Welland Canal. It is this series of locks, canals and channels that links the Atlantic Ocean and St. Lawrence River to Lake Ontario and the four upper Great Lakes.
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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.
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.
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.