| km² | River Basin | % Correct |
|---|---|---|
| 802 k | Danube | 98%
|
| 185 k | Rhine | 96%
|
| 1433 k | Volga | 93%
|
| 75.4 k | Seine | 90%
|
| 73.7 k | Po | 87%
|
| 510 k | Dnieper | 83%
|
| 98.1 k | Rhone | 80%
|
| 117 k | Loire | 78%
|
| 148 k | Elbe | 75%
|
| 437 k | Don | 64%
|
| 193 k | Vistula | 63%
|
| 119 k | Oder | 53%
|
| 84.8 k | Ebro | 51%
|
| 70.8 k | Tagus | 51%
|
| 73.2 k | Dniester | 47%
|
| 211 k | Ural | 44%
|
| 97.3 k | Douro | 41%
|
| 281 k | Neva | 31%
|
| 85.6 k | Daugava | 26%
|
| 92.5 k | Neman | 16%
|
| 357 k | Northern Dvina | 14%
|
| 322 k | Pechora | 11%
|
| 78.0 k | Mezen | 4%
|