Duluth, Minnesota at the western end of the Saint Lawrence Seaway, the Duluth–Superior seaport is the largest and farthest-inland freshwater seaport in North America. By far the largest and busiest on the Great Lakes, the port handles an average of 46 million short tons of cargo and over 1,100 visits each year from domestic and international vessels. With of waterfront, it is one of the leading bulk cargo ports in North America and ranks among the top 20 ports in the United States. Duluth is a major shipping port for taconite pellets, made from concentrated low-grade iron ore and destined for midwestern
Superior, Wisconsin by Saint Louis, Superior, and Allouez bays, the city is framed by two rivers: the Nemadji and the Saint Louis. Superior and the neighboring city across the bay, Duluth, Minnesota, form a single metropolitan area called the Twin Ports. They share a harbor that is one of the most important ports on the Great Lakes. Both cities feature museum ships ("SS William A. Irvin" in Duluth and "" in Superior) devoted to the local maritime heritage. Superior was the final port of call for the "Edmund Fitzgerald" before its sinking in 1975. The first-known inhabitants of what is now Douglas