What is the longest river in the united states?

The longest river in the United States is the Missouri River.

• Length: It stretches approximately 2,341 miles (3,767 kilometers).
• Source: Its source is located in the Rocky Mountains of western Montana.
• Mouth: It flows into the Mississippi River near St. Louis, Missouri.
• Drainage Basin: The Missouri River Basin drains a vast area of the Great Plains.
• Tributaries: The Missouri River has many important tributaries, including the Yellowstone River, the Platte River, and the Kansas River.
• Uses: The river is vital for irrigation, navigation, hydroelectric power, and recreation.
• Historical Significance: It played a crucial role in the exploration and settlement of the American West, particularly the Lewis and Clark Expedition.