Great Lakes-St. Lawrence River

The Great Lakes and St. Lawrence River hold 20 percent of the earth’s fresh surface water or 6 quadrillion gallons, cover a total area of 246,463 square kilometers or 95,160 square miles, and with the St. Lawrence River span 3,700 km (2,342 miles) or almost half of the North American continent. The watershed is one of the world’s most diverse with 3,500 species of plants and wildlife and more than 250 species of fish. 

Great Lakes-St. Lawrence Basin Map