
The Saint Lawrence Seaway (la Voie Maritime du Saint-Laurent) is the common name for a system of locks, canals and channels that permits ocean-going vessels to travel from the Atlantic Ocean to the Great Lakes, as far inland as the western end of Lake Superior. The Seaway is named for the Saint Lawrence River, which flows from Lake Ontario to the ...
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http://en.wikipedia.org/wiki/Saint_Lawrence_Seaway

(from the article `Saint Lawrence River and Seaway`) The St. Lawrence Seaway, a massive navigational project undertaken jointly by Canada and the United States and completed in 1959, opened North ... ...Ohio River–Lake Erie canals provided a tremendous network, extended by the Erie Canal to the Mohawk-Hudson waterway and by the Int...
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http://www.britannica.com/eb/a-z/s/9

[
n] - a seaway involving the Saint Lawrence River and the Great Lakes that was developed jointly by Canada and the United States
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http://www.webdictionary.co.uk/definition.php?query=Saint%20Lawrence%20Seaw
St. Lawrence Seaway noun a seaway involving the Saint Lawrence River and the Great Lakes that was developed jointly by Canada and the United States; oceangoing ships can travel as far west as Lake Superior
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https://www.encyclo.co.uk/local/20974
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