| Hint | Length | Answer | % Correct |
|---|---|---|---|
| D | 2,857 km | Danube | 89%
|
| R | 1,233 km | Rhine | 86%
|
| V | 3,530 km | Volga | 81%
|
| E | 1,094 km | Elbe | 65%
|
| L | 1,006 km | Loire | 54%
|
| T | 1,007 km | Tagus | 49%
|
| U | 2,428 km | Ural | 41%
|
| S | 992 km | Sava | 24%
|
| K | 1,967 km | Kama | 19%
|
| P | 1,809 km | Pechora | 19%
|
| W | 808 km | Warta | 14%
|
| N | 1,685 km | Northern Dvina - Sukhona | 11%
|
| G | 852 km | Guadiana | 8%
|
| O | 1,504 km | Oka | 8%
|
| A | 549 km | Ay | 5%
|
| Y | 574 km | Yug | 5%
|
| B | 1,430 km | Belaya | 3%
|
| H | 659 km | Horyn | 3%
|
| M | 863 km | Manych - Kalaus | 3%
|
| C | 592 km | Chusovaya | 0%
|
| F | 399 km | Faxälven | 0%
|
| I | 571 km | Ik | 0%
|
| J | 498 km | Júcar | 0%
|
| Z | 247 km | Zbruch | 0%
|