| River | % Correct |
|---|---|
| Thames | 99%
|
| Congo | 98%
|
| Rhine | 98%
|
| Seine | 98%
|
| Rio Grande | 97%
|
| Euphrates | 94%
|
| Hudson | 88%
|
| Río de la Plata | 88%
|
| St. Lawrence | 88%
|
| Dnieper | 87%
|
| Yukon | 81%
|
| Ob | 78%
|
| Loire | 77%
|
| Murray | 73%
|
| Amur | 70%
|
| Elbe | 69%
|
| Columbia | 66%
|
| Yenisei | 57%
|
| Volta | 56%
|
| Tagus | 49%
|
| Ural | 40%
|