| Rank | Countries | Length km | River | % Correct |
|---|---|---|---|---|
| 1 | Brazil Peru Bolivia Colombia Ecuador Venezuela Guayana | 6992 | Amazon | 100%
|
| 2 | Ethiopia Eritrea Sudan Tanzania Uganda Kenya Rwanda Burundi Egypt DR Congo South Sudan | 6853 | Nile | 98%
|
| 4 | United States Canada | 6274 | Mississippi | 91%
|
| 6 | China | 5464 | Yellow | 91%
|
| 9 | DR Congo Central African Republic Angola R Congo Tanzania Cameroon Zambia BurundI Rwanda | 4700 | Congo | 89%
|
| 17 | Russia | 3645 | Volga | 89%
|
| 3 | China | 6300 | Yangtze | 89%
|
| 12 | China Myanmar Laos Thailand Cambodia Vietnam | 4350 | Mekong | 87%
|
| 14 | Nigeria Mali Niger Algeria Guinea Cameroon Burkina Faso Cote d'Ivoire Benin Chad | 4200 | Niger | 85%
|
| 18 | Iraq Turkey Syria | 3596 | Euphrates | 72%
|
| 15 | Australia | 3672 | Murray | 62%
|
| 7 | Russia Kazakhstan China Mongolia | 5410 | Ob | 57%
|
| 11 | Russia | 4400 | Lena | 55%
|
| 10 | Russia China Mongolia | 4444 | Amur | 51%
|
| 8 | Brazil Argentina Paraguay Bolivia Uruguay | 4880 | Parana | 49%
|
| 13 | Mackenzie | 4241 | Canada | 43%
|
| 5 | Russia Mongolia | 5539 | Yenisei | 32%
|
| 19 | Brazil Bolivia Peru | 3380 | Madeira | 19%
|
| 20 | Brazil Peru | 3211 | Purus | 17%
|
| 16 | Brazil | 3650 | Tocantins | 13%
|