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St Lawrence River Canada Last Updated: 03/30/2026 |
| The St. Lawrence River and its waterways are of vital geographical and economic importance to the Great Lakes system, connecting the lakes to the Atlantic Ocean and providing a waterway for deep-draft vessels. Its waters flow northeast from Lake Ontario to the Gulf of St. Lawrence, passing through Ontario and Quebec in Canada and New York in the United States. | |
| Approximately 800 miles (1,287 km) long, the St. Lawrence River can be divided into three main sections: the freshwater section, extending from Lake Ontario to just outside Quebec City; the St. Lawrence Estuary, stretching from Quebec to Anticosti Island; and the Gulf of St. Lawrence, which flows into the Atlantic Ocean. | |
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