| 100% | URAL | 4 | Russian river that flows to the Caspian Sea at Guryev |
| 68% | URAL | 4 | River that flows to the Caspian Sea |
| 65% | WEAR | 4 | River that flows to the North Sea at Sunderland |
| 65% | TEES | 4 | River that flows to the North Sea at Middlesbrough |
| 62% | TYNE | 4 | English river that flows to the North Sea at South Shields |
| 59% | UGIE | 4 | River in Scotland that flows to the North Sea at Peterhead |
| 59% | WESER | 5 | River in Germany that flows to the North Sea at Bremerhaven |
| 58% | ELBE | 4 | River in central Europe that flows to the North Sea at Hamburg |
| 58% | TYNE | 4 | River in N England that flows to the North Sea at South Shields |
| 55% | RIBBLE | 6 | River that flows to the Irish Sea near Preston |
| 55% | TAGUS | 5 | River that flows to the Atlantic at Lisbon, Portugal |
| 54% | YANGTZE | 7 | River that flows to the East China Sea near Shanghai, China |
| 54% | TEES | 4 | River that flows into the North Sea at Middlesbrough |
| 54% | TAFF | 4 | River that flows to the Bristol Channel at Cardiff |
| 52% | URAL | 4 | Russian river to the Caspian Sea |
| 51% | TEES | 4 | River that flows through Middlesbrough to the North Sea |
| 49% | ELBE | 4 | 380 mile central European river that flows to the North Sea |
| 49% | VISTULA | 7 | River of Poland that flows to the Baltic Sea near Gdansk |
| 48% | VOLGA | 5 | Longest river in Europe that flows into the Caspian Sea |
| 48% | URAL | 4 | It flows to the Caspian Sea |
| 47% | SAVA | 4 | River rising in Slovenia that flows to the Danube at Belgrade |
| 47% | AVON | 4 | River of central England that flows to the River Severn at Tewkesbury |
| 46% | DON | 3 | River that rises in the Cairngorm Mountains before flowing east to the North Sea |
| 46% | DEE | 3 | River in North Wales and Cheshire that flows to the Irish Sea |
| 45% | VOLGA | 5 | River to the Caspian Sea |
| 45% | URAL | 4 | River to the Caspian Sea |
| 44% | MOSKVA | 6 | River that flows through the Russian capital |
| 44% | TIGRIS | 6 | Asian river that flows to the Euphrates to form the Shatt al-Arab delta |
| 44% | SAINTMAURICE | 12 | River rising in Quebec, Canada, that flows to the St Lawrence at Trois-Rivieres |
| 44% | DNIEPER | 7 | Russian river that empties into the Black Sea |