Map of North America and the Great Lakes

At Sault Ste. Marie, Michigan, the Soo Locks assist the Great Lakes freighters in transiting from Lake Superior to the minor lakes below like Lake Michigan or the minor lakes to Lake Huron, Lake Erie, and Lake Ontario via the Welland Canal (parallel to the Niagara Falls) to the Saint Lawrence Seaway, and finally to the Atlantic Ocean.

MAP OF NORTH AMERICA AND THE GREAT LAKES