Top 20 longest river systems

This post is a list of the top 20 longest river systems in the world. Source: Wikipedia

1. Nile, Africa: 6.6 thousand km
2. Amazon, South America: 6.4 thousand km
3. Yangtze, China: 6.3 thousand km
4. Mississippi, United States, Canada: 6.2 thousand km
5. Yenisey, Russia, Mongolia: 5.5 thousand km
6. Yellow, China: 5.4 thousand km
7. Ob, Eurasia: 5.4 thousand km
8. Río de la Plata, South America: 4.8 thousand km
9. Congo, Africa: 4.7 thousand km
10. Amur, Eurasia: 4.4 thousand km
11. Lena, Russia: 4.4 thousand km
12. Mekong, China, Southeast Asia: 4.3 thousand km
13. Mackenzie, Canada: 4.2 thousand km
14. Niger, Africa: 4.2 thousand km
15. Brahmaputra, South Asia, China: 3.9 thousand km
16. Murray, Australia: 3.6 thousand km
17. Tocantins, Brazil: 3.6 thousand km
18. Volga, Russia: 3.6 thousand km
19. Indus, South Asia, China: 3.6 thousand km
20. Shatt al-Arab, Middle East: 3.5 thousand km