Duluth, Minnesota Lakes Waterway and the Saint Lawrence Seaway. Duluth forms a metropolitan area with neighboring Superior, Wisconsin, called the Twin Ports. The cities share the Duluth–Superior harbor and together are the Great Lakes' largest port, transporting coal, iron ore (taconite), and grain. A tourist destination for the Midwest, Duluth features the United States' only all-freshwater aquarium, the Great Lakes Aquarium; the Aerial Lift Bridge, which spans the Duluth Ship Canal into the Duluth–Superior Harbor; and Minnesota Point (known locally as Park Point), the world's longest freshwater baymouth bar, spanning . The city is also the starting point for vehicle trips along
Lake Superior Chippewa out of most of northern Wisconsin and northeastern Minnesota into the western plains. The Sioux (Lakota) were pushed to the west, where they eventually settled in the Great Plains of present-day Nebraska and the Dakotas. The Ojibwe successfully spread throughout the Great Lakes region, with colonizing bands settling along lakes and rivers throughout what would become northern Michigan, Wisconsin and Minnesota in the United States. La Pointe on Madeline Island remained the spiritual and commercial center of the nation. The island is listed on the National Register of Historic Places. The Lake Superior Chippewa were numerous and contained many bands.