Nile River is the longest river in the whole wide world and has the length of 4,132 miles. It passes through 10 countries, Egypt being one of them. Amazon River in South America is the 2nd longest river in the world. The length of Amazon River is 3,976 miles.
Yangtze River, the 3rd longest river with 3,917 miles in length is also the longest river in Asian Continent. The fact is that river basin of Yangtze is home to about one-third of the population of PRC (People's Republic of China).
Missouri River which is longest river in USA and when joined with Mississippi and Jefferson Rivers becomes the 4th longest river in the world and the combined lenght of these 3 rivers is 3,902 miles.