Situated at the westernmost point of the Great Lakes on the north shore of Lake Superior , Duluth is accessible to oceangoing vessels from the Atlantic Ocean 2,300 miles ( 3,700 km ) away via the Great Lakes Waterway and the Saint Lawrence Seaway .
The harbor at Duluth is accessible to ocean-going vessels from the Atlantic Ocean 2,300 miles ( 3,700 km ) away via the Great Lakes and Saint Lawrence Seaway .