Whats the biggest river in north America?

The Mississippi River is the longest river in North America. It flows for about 3,734 miles (6,009 kilometers) from its source at Lake Itasca in Minnesota to its mouth at the Gulf of Mexico. The Mississippi River Basin is the largest in North America, covering an area of about 1,245,000 square miles (3,225,000 square kilometers). The Mississippi River is a vital transportation route, and it has been used for trade and travel for centuries.