The Rust Belt, sometimes calle the Manufacturing Belt, is an area in parts of the Northeastern United States, Mid-Atlantic States, and portions of the Upper Midwest. The region can be broadly defined as the region beginning west of the BosWash corridor and running west to Minnesota, particularly the city of Duluth and the Iron Range. Because the area's economy is often defined by the collapse of the steel industry and other heavy manufacturing, and the fact that iron is the key component in steel, Minnesota, with its massive iron mining operations and subsequent economic decline, is often considered to be "where the Rust Belt begins", though the area immediate to Lake Erie is considered to be the "hub" of the region. It extends southward to the beginnings of the coal mining regions of Appalachia, north to the Great Lakes and includes manufacturing regions of southern Ontario in Canada.