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, Minnesota winter of 1997–98. The Blue Heron is part of the University National Oceanographic Laboratory System, and is available for charter by research scientists on any of the Great Lakes. Local newspapers include the "BusinessNorth" monthly, the "Duluth News Tribune", the "Duluth Budgeteer News," the free newspapers "Transistor", "The Zenith", and "The Reader Weekly". Locally based nationally distributed magazines include "Cabin Life", "Lake Superior Magazine," and "New Moon Magazine". The Duluth area marks the northern endpoint of Interstate Highway 35, which stretches south to Laredo, Texas. U.S. Highways that serve the area are U.S. Highway 53, which stretches from La Crosse,