The top 5 longest rivers on earth:

1. The Nile River

Length:6,650 KM(4,132 Miles)

Location: Africa(running through 10 countries)

2. The Amazon River

Length: 6400 KM(3,976 Miles)

Location: South America(running through 6 countries)

3. The Yangtze River

Length: 6300 KM(3915 Miles)

Location: Asia(China)

4. The Mississippi/Missouri River 

Length: 6,275 KM(3899 Miles)

Location: North America(The United States)

5. The Yenisei/Angara/Selenga River

Length: 5,539 KM(3441 Miles)
Location: Europe/Asia(Russia/Mongolia)