| Length | Continent | River | % Correct |
|---|---|---|---|
| 6437 km | South America | Amazon | 100%
|
| 6854 km | Africa | Nile | 100%
|
| 6387 km | Asia | Yangtze | 95%
|
| 3734 km | North America | Mississippi | 91%
|
| 5464 km | Asia | Yellow | 91%
|
| 2860 km | Europe | Danube | 86%
|
| 4699 km | Africa | Congo | 84%
|
| 2525 km | Asia | Ganges | 84%
|
| 3767 km | North America | Missouri | 84%
|
| 3691 km | Europe | Volga | 84%
|
| 4179 km | Africa | Niger | 79%
|
| 3051 km | North America | Rio Grande | 77%
|
| 4350 km | Asia | Mekong | 74%
|
| 3650 km | Asia | Ob | 74%
|
| 4879 km | South America | Paraná | 72%
|
| 2333 km | North America | Colorado | 70%
|
| 4400 km | Asia | Lena | 70%
|
| 2824 km | Asia | Amur | 63%
|
| 2900 km | Asia | Brahmaputra | 63%
|
| 3199 km | Asia | Indus | 63%
|
| 2507 km | Oceania | Murray | 63%
|
| 3186 km | North America | Yukon | 63%
|
| 2573 km | Africa | Zambezi | 63%
|
| 2800 km | Asia | Euphrates | 60%
|
| 2140 km | South America | Orinoco | 60%
|
| 3487 km | Asia | Yenisei | 58%
|
| 2291 km | Europe | Dnieper | 51%
|
| 2200 km | Africa | Orange | 49%
|
| 2231 km | South America | Negro | 47%
|
| 2622 km | South America | Paraguay | 47%
|
| 2364 km | North America | Arkansas | 44%
|
| 2170 km | Asia | Irrawaddy | 42%
|
| 2428 km | Europe / Asia | Ural | 42%
|
| 2189 km | North America | Red | 40%
|
| 4249 km | Asia | Irtysh | 37%
|
| 2639 km | South America | Tocantins | 37%
|
| 3249 km | South America | Madeira | 35%
|
| 2829 km | South America | São Francisco | 35%
|
| 2399 km | Asia | Salween | 33%
|
| 2211 km | Asia | Syr Darya | 33%
|
| 2036 km | South America | Japurá | 26%
|
| 3211 km | South America | Purus | 26%
|
| 2575 km | North America | Nelson | 21%
|
| 2273 km | Asia | Aldan | 16%
|
| 2988 km | Asia | Nizhny Tunguska | 14%
|
| 2626 km | South America | Araguaia | 12%
|
| 2412 km | South America | Juruá | 12%
|
| 2449 km | Asia | Ishim | 9%
|
| 2292 km | Asia | Olenyok | 2%
|
| 2651 km | Asia | Vilyuy | 2%
|