Where Is the St. Lawrence River Located?

The St. Lawrence River begins on Lake Ontario in Canada and flows for 744 miles until it reaches the Gulf of St. Lawrence. Being one of the longest rivers in North America, the river provides outflow for all of the Great Lakes. The majority of the river flows though Canada, with only 114 of the total 744 miles of its length flowing through the United States.

Discharging 347,849 cubic feet of water per second, the St. Lawrence River provides drinking water to towns all long its borders. There are precisely 1,864 islands in the upper St. Lawrence region, which is commonly referred to as the "Thousand Islands region." On June 9, 1534, a French man named Jacques Cartier would become the first European explorer to discover the St. Lawrence River.