| 1. | a river in SE Canada, flowing NE from Lake Ontario, forming part of the boundary between New York and Ontario, and emptying into the Gulf of St. Lawrence. 760 mi. (1225 km) long. |
| 2. | Gulf of, an arm of the Atlantic between SE Canada and Newfoundland. |
| Saint Lawrence River A river of southeast Canada flowing about 1,207 km (750 mi) northeast from Lake Ontario along the Ontario-New York border and through southern Quebec to the Gulf of St. Lawrence. The river was first sighted by Jacques Cartier in 1534; in 1535 he ascended it as far as the site of the modern-day city of Montreal. Long a water highway for explorers, missionaries, and fur traders, it is today a major shipping route. |