| Length in KM | River | % Correct |
|---|---|---|
| 3530 | Volga | 94%
|
| 3650 | Ob | 90%
|
| 4400 | Lena | 82%
|
| 2824 | Amur | 76%
|
| 5539 | Yenisei | 65%
|
| 1950 | Don | 61%
|
| 2428 | Ural | 50%
|
| 2129 | Kolyma | 24%
|
| 1809 | Pechora | 23%
|
| 1726 | Indigirka | 12%
|