St. Lawrence River
General data
- Name: St. Lawrence River
- Water system: Gulf of St. Lawrence
- Water type: River
- Source: Lake Ontario
- Progression: Gulf of St. Lawrence -> Atlantic Ocean -> Planet Earth
- Climates:
- Continents: North America
- Countries: Canada, United States of America
The St. Lawrence River is a large river in the middle latitudes of North America. The St. Lawrence flows in a roughly north-easterly direction, connecting the Great Lakes with the Atlantic Ocean and forming the primary drainage outflow of the Great Lakes Basin. It traverses the Canadian provinces of Quebec and Ontario, and is part of the international boundary between Ontario, Canada, and the U.S. state of New York. This river provides the basis for the commercial St. Lawrence Seaway. Today, the St. Lawrence River begins at the outflow of Lake Ontario and flows adjacent to Gananoque, Brockville, Morristown, Ogdensburg, Massena, Cornwall, Montreal, Trois-Rivières, and Quebec City before draining into the Gulf of St. Lawrence, the largest estuary in the world. The estuary begins at the eastern tip of Île dOrléans, just downstream from Quebec City. The river becomes tidal around Quebec City.