The Great Lakes basin is home to about 40 million people, covering parts of the U.S. and Canada.

The Great Lakes basin, one of the largest freshwater ecosystems in the world, is home to approximately 40 million people. This region spans several U.S. states, including Michigan, Ohio, Illinois, and New York, as well as parts of Canada, particularly the province of Ontario. Major cities like Chicago, Detroit, and Toronto are located within the basin, making it a densely populated and highly urbanized area. The basin is crucial for drinking water, industry, and agriculture, as well as for recreational activities, contributing significantly to the economies and livelihoods of its residents.