The longest river in the world is usually thought to be the Nile River, although there is some debate about this. The Nile is 4,132 miles long, with two major tributaries: the Blue Nile and the White Nile.
The longest river in the world is the Nile. Immediately following the Nile on the list of the world's longest rivers are, in order: the Amazon, the Yangtze, and the Mississippi-Missouri.
