6 Longest Rivers in the WorldDetermining the world's longest river is more challenging than you might think. There's often debate over where a river actually starts. With that in mind, we looked into the most agreed-upon top six longest rivers in the world. Here they are. Yellow RiverCredit: Jixin YU/ShutterstockThe Yellow River, also known as the Huang He, is the sixth longest river in the world and the second longest in China. The river measures 3,395 miles long, and runs from the Bayan Har Mountains in Western China to the Bohai Sea. While the Yellow River was the...