| River | % Correct |
|---|---|
| Congo | 99%
|
| Thames | 99%
|
| Rhine | 97%
|
| Seine | 97%
|
| Rio Grande | 96%
|
| Euphrates | 95%
|
| Río de la Plata | 88%
|
| St. Lawrence | 88%
|
| Hudson | 87%
|
| Dnieper | 85%
|
| Yukon | 83%
|
| Loire | 77%
|
| Ob | 76%
|
| Murray | 75%
|
| Amur | 69%
|
| Elbe | 69%
|
| Columbia | 64%
|
| Volta | 55%
|
| Yenisei | 55%
|
| Tagus | 49%
|
| Ural | 39%
|