| 100% | TAFF | 4 | River that flows to the Bristol Channel at Cardiff |
| 61% | TAGUS | 5 | River that flows to the Atlantic at Lisbon, Portugal |
| 60% | WEAR | 4 | River that flows to the North Sea at Sunderland |
| 60% | TEES | 4 | River that flows to the North Sea at Middlesbrough |
| 57% | URAL | 4 | Russian river that flows to the Caspian Sea at Guryev |
| 57% | TYNE | 4 | English river that flows to the North Sea at South Shields |
| 54% | DART | 4 | River in Devon that flows into the English Channel at Dartmouth |
| 54% | UGIE | 4 | River in Scotland that flows to the North Sea at Peterhead |
| 54% | WESER | 5 | River in Germany that flows to the North Sea at Bremerhaven |
| 53% | URAL | 4 | River that flows to the Caspian Sea |
| 53% | STOUR | 5 | River in Kent that flows into the English Channel at Pegwell Bay |
| 52% | SAVA | 4 | River rising in Slovenia that flows to the Danube at Belgrade |
| 52% | RIBBLE | 6 | River that flows to the Irish Sea near Preston |
| 52% | AVON | 4 | River of central England that flows to the River Severn at Tewkesbury |
| 52% | ELBE | 4 | River in central Europe that flows to the North Sea at Hamburg |
| 51% | TYNE | 4 | River in N England that flows to the North Sea at South Shields |
| 51% | YANGTZE | 7 | River that flows to the East China Sea near Shanghai, China |
| 50% | ELBE | 4 | 380 mile central European river that flows to the North Sea |
| 49% | TIGRIS | 6 | Asian river that flows to the Euphrates to form the Shatt al-Arab delta |
| 49% | SAINTMAURICE | 12 | River rising in Quebec, Canada, that flows to the St Lawrence at Trois-Rivieres |
| 48% | CAM | 3 | River that flows through Cambridge to the River Ouse |
| 48% | TEES | 4 | River that flows into the North Sea at Middlesbrough |
| 48% | TEES | 4 | River that flows through Middlesbrough to the North Sea |
| 46% | PECOS | 5 | River that flows from New Mexico through Texas to the Rio Grande |
| 46% | RIOGRANDE | 9 | River that flows from Colorado to the Gulf of Mexico: 2 wds. |
| 46% | RIO | 3 | ___ Grande (river that flows to the Gulf of Mexico) |
| 45% | EBRO | 4 | River in Spain that flows to the Mediterranean southwest of Tarragona |
| 45% | VISTULA | 7 | River of Poland that flows to the Baltic Sea near Gdansk |
| 44% | OUSE | 4 | River in England that flows to the Wash near King's Lynn |
| 44% | ADIGE | 5 | River in North Italy that flows to the Adriatic via Verona |