The Twin Ports of Duluth, Minnesota and Superior, Wisconsin are located at the western part of Lake Superior (the westernmost of North America's Great Lakes) and together are considered the largest freshwater port in the world. They are twin cities and seaports, connected to the Atlantic Ocean through the Great Lakes and the Saint Lawrence Seaway. The Twin Ports are at the core of the U.S. Census Bureau's "Duluth, MN-WI Metropolitan Statistical Area", which includes all of Wisconsin's Douglas County, and Minnesota's Carlton and Saint Louis counties. With a 2010 census population of 279,771, the Duluth MSA ranked as the 165th largest metropolitan area in the United States.