| Length | End Country | River | % Correct |
|---|---|---|---|
| 6,992 km | Brazil | Amazon | 100%
|
| 4,700 km | Congo | Congo | 97%
|
| 2,888 km | Romania | Danube | 97%
|
| 6,275 km | United States | Mississippi | 97%
|
| 4,200 km | Nigeria | Niger | 97%
|
| 6,853 km | Egypt | Nile | 97%
|
| 3,057 km | Mexico | Rio Grande | 83%
|
| 3,058 km | Canada | St. Lawrence | 77%
|
| 4,880 km | Brazil | Paraná | 63%
|
| 3,180 km | Brazil | São Francisco | 43%
|
| 3,650 km | Brazil | Tocantins | 27%
|
| 3,380 km | Brazil | Madeira | 20%
|
| 3,211 km | Brazil | Purús | 10%
|
| 2,627 km | Brazil | Araguaia | 7%
|
| 2,615 km | Brazil | Japurá | 7%
|