St. Lawrence River vs. St. Lawrence Seaway

Related but Distinct

The St. Lawrence River is a natural waterway flowing from Lake Ontario to the Atlantic Ocean, forming part of the Canada–U.S. border.

The St. Lawrence Seaway is a man-made system of locks, canals, and dams that allows ships to bypass the river's natural rapids and shallows, enabling navigation between the Great Lakes and the Atlantic.

The Seaway is a vital shipping route for both nations, accommodating large vessels that the natural river alone could not handle.