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
Knife River (Lake Superior) unincorporated community of Knife River, Minnesota, located at the river's mouth. Knife River (Lake Superior) The Knife River is a river of northern Minnesota which drains a portion of Lake and Saint Louis counties into Lake Superior between Duluth and Two Harbors. The Knife River's name is an accurate preservation of its native Ojibwe name, "Mokomani Zibi". Its original name was probably given on account of the long, sharp stones near the mouth of the river. The main branch of the Knife River flows from source to mouth, flowing parallel to the shoreline from the direction of Two Harbors. It