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
Bad River Band of the Lake Superior Tribe of Chippewa Indians from crossing the reservation; it was destined for a copper mine in Michigan. The protestors complained the acid posed an environmental danger to reservation lands and the Lake Superior watershed. The national attention brought by the protests forced the Environmental Protection Agency to stop the use of acid in the mine. The headquarters of the Great Lakes Indian Fish & Wildlife Commission (GLIFWC) is on the Bad River Reservation. The tribe also owns and operates a fish hatchery, which stocks local rivers and lakes with 15 million walleye annually. The Bad River Band Of Lapoint Ojibwe own and operate a