Major cities like Pittsburgh, Cincinnati, and Louisville along its banks. - Longest river entirely in Texas. - Watershed: 45,600 sq miles. - Famous for reservoirs like Lake Possum Kingdom.

Many people assume the longest river in the U.S. is the Mississippi, but that title belongs to the Missouri and part of American agriculture history.

The Nile River is the world’s and Africa’s longest river, spanning 4,130 miles (6,650 km). The river flows from the White Nile near Lake Victoria and the Blue Nile from Lake Tana, and joined ...