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
Duluth Transit Authority Duluth Transit Authority The Duluth Transit Authority (DTA) is the transit agency that provides mass transit service — currently, only buses — in the city of Duluth, Minnesota, United States. The agency also serves nearby Proctor, Minnesota, and Superior, Wisconsin, as well as the eastern edge of Hermantown, Minnesota. The organization was formed in 1969 by the Minnesota State Legislature. In 2009, the DTA was named Transit System of the Year by the Minnesota Public Transit Association. Express service is provided during rush hours to New Duluth (2X), Proctor (3X), Lakeside (7X – PM only), Superior (16X – PM only),