The river that forms part of the border between the U.S. and Canada is the St. Lawrence River. This significant waterway flows from the Great Lakes into the Gulf of St. Lawrence, serving as a vital shipping route and enabling trade between the two nations. The St. Lawrence River is also known for its importance in hydroelectric power generation and its ecological diversity. Various fish species thrive in its waters, attracting recreational anglers. The river's rich history includes its role in the early exploration and settlement of North America, making it an essential geographic and cultural feature.