| 100% | TIGRIS | 6 | Asian river that flows to the Euphrates to form the Shatt al-Arab delta |
| 50% | URE | 3 | River of North Yorkshire that flows to the Swale to form the Ouse |
| 42% | URAL | 4 | River that flows to the Caspian Sea |
| 41% | TAFF | 4 | River that flows to the Bristol Channel at Cardiff |
| 41% | TAGUS | 5 | River that flows to the Atlantic at Lisbon, Portugal |
| 41% | WEAR | 4 | River that flows to the North Sea at Sunderland |
| 41% | TEES | 4 | River that flows to the North Sea at Middlesbrough |
| 41% | RIBBLE | 6 | River that flows to the Irish Sea near Preston |
| 41% | YANGTZE | 7 | River that flows to the East China Sea near Shanghai, China |
| 40% | URAL | 4 | Russian river that flows to the Caspian Sea at Guryev |
| 40% | XINGU | 5 | River in Brazil that rises on the Mato Grosso plateau before flowing north to the Amazon delta |
| 40% | DOURO | 5 | River that forms part of the border between Spain and Portugal before flowing west to the Atlantic |
| 40% | TYNE | 4 | English river that flows to the North Sea at South Shields |
| 40% | ELBE | 4 | 380 mile central European river that flows to the North Sea |
| 39% | ADIGE | 5 | River in North Italy that flows to the Adriatic via Verona |
| 39% | EBRO | 4 | River in Spain that flows to the Mediterranean southwest of Tarragona |
| 39% | UGIE | 4 | River in Scotland that flows to the North Sea at Peterhead |
| 39% | ADIGE | 5 | River in N Italy that flows to the Adriatic via Verona |
| 39% | ADIGE | 5 | River in northern Italy that flows to the Adriatic via Verona |
| 39% | SAVA | 4 | River rising in Slovenia that flows to the Danube at Belgrade |
| 39% | WESER | 5 | River in Germany that flows to the North Sea at Bremerhaven |
| 39% | VISTULA | 7 | River of Poland that flows to the Baltic Sea near Gdansk |
| 38% | AVON | 4 | River of central England that flows to the River Severn at Tewkesbury |
| 38% | SWALE | 5 | River in North Yorkshire that joins the Ure to form the Ouse |
| 38% | DEE | 3 | River in North Wales and Cheshire that flows to the Irish Sea |
| 38% | OUSE | 4 | River in England that flows to the Wash near King's Lynn |
| 38% | ELBE | 4 | River in central Europe that flows to the North Sea at Hamburg |
| 38% | SWAN | 4 | River in SW Australia that flows to the Indian Ocean below Perth |
| 38% | SWAN | 4 | River in southwest Australia that flows to the Indian Ocean below Perth |
| 38% | SPEY | 4 | River in Scotland that flows through the Grampian Mountains to the Moray Firth |