| 100% | SPEY | 4 | River in Scotland that flows through the Grampian Mountains to the Moray Firth |
| 54% | UGIE | 4 | River in Scotland that flows to the North Sea at Peterhead |
| 53% | MAIN | 4 | River in Germany that flows through Wurzburg to the Rhine |
| 51% | DRIN | 4 | River rising in Macedonia that flows through Albania to the Adriatic |
| 51% | SIRET | 5 | River rising in Ukraine that flows through Romania to the Danube |
| 49% | CLYDE | 5 | River in Scotland that flows through Glasgow |
| 46% | SAAR | 4 | River rising in the Vosges Mountains that flows north to the Moselle in Germany |
| 46% | DON | 3 | River that rises in the Cairngorm Mountains before flowing east to the North Sea |
| 46% | SAAR | 4 | River rising in the Vosges Mountains that flows north to the Moselle River in Germany |
| 46% | EBRO | 4 | River in Spain that flows to the Mediterranean southwest of Tarragona |
| 46% | WESER | 5 | River in Germany that flows to the North Sea at Bremerhaven |
| 45% | OUSE | 4 | River in England that flows to the Wash near King's Lynn |
| 45% | LENA | 4 | River in Russia that rises in Siberia before flowing to the Laptev Sea |
| 44% | SAVA | 4 | River rising in Slovenia that flows to the Danube at Belgrade |
| 43% | CAM | 3 | River that flows through Cambridge to the River Ouse |
| 43% | TEES | 4 | River that flows through Middlesbrough to the North Sea |
| 42% | SAN | 3 | River rising in Ukraine that flows across SE Poland to the Vistula |
| 42% | SAN | 3 | River rising in Ukraine that flows across southeast Poland to the Vistula |
| 42% | XINGU | 5 | River in Brazil that rises on the Mato Grosso plateau before flowing north to the Amazon delta |
| 41% | SAINTMAURICE | 12 | River rising in Quebec, Canada, that flows to the St Lawrence at Trois-Rivieres |
| 41% | YSER | 4 | River rising in northern France that flows through Belgium into the North Sea at Nieuwpoort |
| 41% | GODAVARI | 8 | River rising in Maharashtra, India sacred to Hindus that flows to the Bay of Bengal |
| 41% | INDUS | 5 | River rising in SW Tibet that flows south-west across Pakistan to the Arabian Sea |
| 41% | ADIGE | 5 | River in North Italy that flows to the Adriatic via Verona |
| 41% | ADIGE | 5 | River in N Italy that flows to the Adriatic via Verona |
| 41% | ADIGE | 5 | River in northern Italy that flows to the Adriatic via Verona |
| 41% | ORD | 3 | River in Western Australia that flows north to the Timor Sea |
| 41% | YEO | 3 | River in England that flows through Congresbury |
| 40% | PECOS | 5 | River that flows from New Mexico through Texas to the Rio Grande |
| 40% | DEE | 3 | River in North Wales and Cheshire that flows to the Irish Sea |