longest river is us
The longest river in the United States is the Missouri River. The Missouri River starts in Montana and covers 2,540 miles before flowing into the Mississippi River, the second longest river in the United States. The Missouri-Mississippi river system is the third longest river in the world. The longest undammed river in the contiguous USA is the Yellowstone River at 692 miles in length. The 10 longest rivers in the United Sates are: Missouri: 2,540 miles. Mississippi: 2,340 miles. Yukon: 1,980 miles.