Top 3 Longest Rivers in the World Number 1 Nile River It's more than 6,650 km long It starts from Victoria Lake in Uganda and into Mediterranean Sea It passes through 10 countries of Africa along with Number 2 The Amazing River It's 6,575 km long It starts from endless mountains of Peru travel to five countries of South America and ends to Atlantic Ocean Number 3 The Amazing River It's more than 6,397 km long It is the longest river in Asia It starts from glacial melt waters of the Tengual Mountain and ends to its China Sea