How long is the world's longest river, the Nile?

Explanation

The Nile is, with its 6,800 km, the longest river in the world. It has two major tributaries that meet in Sudan - the White Nile and the Blue Nile. The Blue Nile starts in Ethiopia, whereas the White Nile rises in Lake Victoria in Uganda. The Nile then runs through Egypt and into the Mediterranean Sea.