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The second longest river in North America and the United States is the Mississippi River (2,320 mi (3,730 km)). The Rio Conchos (350 mi (560 km)) is the longest river in Mexico. The longest river in Canada is the Mackenzie River (1,080 mi (1,740 km)).
Three—the Milk River, the Red River of the North, and the Saint Lawrence River—begin in the United States and flow into Canada; two do the opposite (Yukon and Columbia). Also a segment of the Saint Lawrence River forms the international border between part of the province of Ontario, Canada, and the U.S. state of New York.
North America: Red River: 2,187 2,190 1,360 239,195 Atchafalaya: Tributary river [116] 159 South America: ... Largest rivers in the world by volume discharge: River
All rivers with average discharge more than 15,000 cubic feet per second are listed. Estimates are approximate, because data are variable with time period measured and also because many rivers lack a gauging station near their point of outflow.
List of longest rivers of the United States (by main stem) List of longest rivers of the United States by state; List of rivers of the United States by discharge; List of National Wild and Scenic Rivers; List of river borders of U.S. states; List of rivers of U.S. insular areas; List of rivers of the Americas by coastline
North Canadian River – 440 miles (710 km) Verdigris River – 310 miles (500 km) Washita River – 295 miles (475 km) North Fork Red River – 271 miles (436 km) Salt Fork Arkansas River – 239 miles (385 km) The North Canadian River is the longest river that is entirely within Oklahoma. See also List of rivers of Oklahoma.
Even when detailed maps are available, the length measurement is not always clear. A river may have multiple channels, or anabranches. The length may depend on whether the center or the edge of the river is measured. It may not be clear how to measure the length through a lake or reservoir. Seasonal and annual changes may alter both rivers and ...
The Great Basin's longest and largest river is the Bear River of 350 mi (560 km), [10] and the largest single watershed is the Humboldt River drainage of roughly 17,000 sq mi (44,000 km 2). Most Great Basin precipitation is snow, and the precipitation that neither evaporates nor is extracted for human use will sink into groundwater aquifers ...