Lake Superior islands include Madeline Island in the state of Wisconsin, Michipicoten Island in the province of Ontario, and Grand Island (the location of the Grand Island National Recreation Area) in the state of Michigan. The larger cities on Lake Superior include the twin ports of Duluth, Minnesota and Superior, Wisconsin; Thunder Bay, Ontario; Marquette, Michigan; and the twin cities of Sault Ste. Marie, Michigan, and Sault Ste. Marie, Ontario. Duluth-Superior, at the western end of Lake Superior, is the most inland point on the St. Lawrence Seaway and the most inland port in the world. Among the scenic places on the
Duluth Ship Canal of adverse weather. Around a thousand vessels a year ship from the Duluth–Superior port. The construction of the first locks on the St. Marys River in 1855 allowed for navigation between the lakes, and Superior Bay presented itself as an attractive harbor. From the point of view of Duluth residents, however, arrangements were less than satisfactory, as ships from that city had to pass Superior, Wisconsin on the way to the lake, as the only natural outlet was between Minnesota Point and Wisconsin Point at the far end of the bay. Also, while sheltered, the bay was not naturally as