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 surfer Mark Anderson from St. Paul described the Duluth surfing experience as "...standing in the snow, jumping off of an ice-covered rock into Lake Superior to go catch waves that any surfer anywhere in the world, pro or beginner, would envy." Erik Wilkie, a surfer originally from California interviewed by MPR, remarked that while Lake Superior surfing may look easy, it can be dangerous. "There's the ice-cold freshwater, which is not as buoyant as saltwater. Lake waves also appear every five seconds or so, much faster than those in the ocean. If you take off on the first or second