| 100% | CAM | 3 | River that flows through Cambridge to the River Ouse |
| 71% | TEES | 4 | River that flows through Middlesbrough to the North Sea |
| 68% | MAIN | 4 | River in Germany that flows through Wurzburg to the Rhine |
| 68% | DRIN | 4 | River rising in Macedonia that flows through Albania to the Adriatic |
| 68% | SIRET | 5 | River rising in Ukraine that flows through Romania to the Danube |
| 62% | PECOS | 5 | River that flows from New Mexico through Texas to the Rio Grande |
| 62% | SPEY | 4 | River in Scotland that flows through the Grampian Mountains to the Moray Firth |
| 59% | URE | 3 | River of North Yorkshire that flows to the Swale to form the Ouse |
| 59% | RHINE | 5 | River that flows through Germany and the Swiss Alps |
| 59% | ORD | 3 | River in Western Australia that flows north to Cambridge Gulf and the Timor Sea |
| 58% | YSER | 4 | River that flows through the ganzepoot |
| 57% | COLORADO | 8 | River that flows through the Grand Canyon |
| 57% | MOSKVA | 6 | River that flows through the Russian capital |
| 57% | AVON | 4 | River flowing through Bristol to the Severn |
| 57% | RIOGRANDE | 9 | River that flows from Colorado to the Gulf of Mexico: 2 wds. |
| 57% | VLTAVA | 6 | River that flows through the heart of Prague |
| 57% | UBANGI | 6 | River that flows through the city of Bangui |
| 56% | ELBE | 4 | European river that flows through the Czech Republic |
| 55% | URAL | 4 | River that flows to the Caspian Sea |
| 54% | TAFF | 4 | River that flows to the Bristol Channel at Cardiff |
| 54% | TAGUS | 5 | River that flows to the Atlantic at Lisbon, Portugal |
| 54% | WEAR | 4 | River that flows to the North Sea at Sunderland |
| 54% | TEES | 4 | River that flows to the North Sea at Middlesbrough |
| 54% | RIBBLE | 6 | River that flows to the Irish Sea near Preston |
| 53% | YSER | 4 | River rising in northern France that flows through Belgium into the North Sea at Nieuwpoort |
| 53% | YANGTZE | 7 | River that flows to the East China Sea near Shanghai, China |
| 52% | URAL | 4 | Russian river that flows to the Caspian Sea at Guryev |
| 52% | REUSS | 5 | River of Switzerland that flows through Lake Lucerne and the town of Bremgarten |
| 51% | TYNE | 4 | English river that flows to the North Sea at South Shields |
| 51% | ELBE | 4 | 380 mile central European river that flows to the North Sea |