Saint Lawrence River Map with its Tributaries, and River Basin

The Saint Lawrence River is a large international river in the middle latitude. The Saint Lawrence River map shows that this river connects the Great Lakes of North America to the North Atlantic Ocean. This river flows from Lake Ontario, toward the northeast direction to the Gulf of St Lawrence. A section of this river is along the border of Ontario in Canada and New York in the United States, then, it enters Quebec Canada, and drains into the Gulf of St Lawrence at Quebec City, Canada. This river has the second-highest volume of water in North America because of the primary outflow of the Great Lake Basin. This river played a key role in the historical development of Canada and major cities like Montreal and Quebec City. Similarly, this river is a long transportation route for indigenous people. This river is important for shipping routes. The total length of this river is 3058 kilometers (1900 miles) from the headwater to the mouth. The headwater of this river is at the Mesabi Range at Hibbing of Minnesota state of the United States. The average discharge of this river is 7,410 m³/s (262,000 cu ft/s) at the outflow of Lake Ontario.

Saint Lawrence River Basin

The Saint Lawrence River maps show that the green color is the river basin, which is 1,344,200 km² (518,998.5 square miles). The area falls 62.4% of the total area or 839,200 km² (324,016.9 sq mi) area is in Canada and 37.6% of the total area or 505,000 km² (194,981.6 sq. miles) area is in the United States. The Saint Lawrence River map shows that the basin area falls in Ontario and Quebec states of Canada, and Minnesota, Wisconsin, Illinois, Ohio, Pennsylvania, New York, Vermont, and Michigan states of the United States.