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St. Lawrence Seaway

a series of channels, locks, and canals between Montreal and the mouth of Lake Ontario, a distance of 182 miles (293 km), enabling most deep-draft vessels to travel from the Atlantic Ocean, up the St. Lawrence River, to all the Great Lakes ports: developed jointly by the U.S. and Canada. Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2016.
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British Dictionary definitions for saint lawrence seaway

Saint Lawrence Seaway

an inland waterway of North America, passing through the Great Lakes, the St Lawrence River, and connecting canals and locks: one of the most important waterways in the world. Length: 3993 km (2480 miles)
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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