Laurentia (bioregion)

Along with the bioregional similarities throughout the region, and the water cycle of the Great Lakes and regional namesake Saint Lawrence River, there are also strong cultural and economic connections in Laurentia. The Ambassador Bridge between Detroit and Windsor, Ontario is the busiest border crossing in North America. [5]

The Laurentian region was the destination of freed black slaves during the days of the Underground Railroad, both in the northern U.S. states and in Canada. In the nineteenth century, the border was porous and to this day family ties between American and Canadian Laurentians continue.

Laurentia includes many of the largest North American cities, including New York City, Chicago, Philadelphia, Washington, D.C., Boston, Toronto, Detroit, Indianapolis, St. Louis, Cleveland, Montreal, Cincinnati, Pittsburgh, Baltimore, Milwaukee, Buffalo, Columbus and Minneapolis/St. Paul.

• Cascadia, the northwestern North American bioregion, also including parts of the United States and Canada, with an active independence movement
• Laurentia, a geological craton
• Niagara Falls