| 100% | TAW | 3 | River that flows from Dartmoor to Barnstaple Bay in Devon |
| 68% | TAW | 3 | River that flows from Dartmoor to Barnstaple |
| 46% | NILE | 4 | River that flows from Burundi to Egypt |
| 45% | NIAGARA | 7 | River in North America that flows from Lake Erie to Lake Ontario |
| 44% | PECOS | 5 | River that flows from New Mexico through Texas to the Rio Grande |
| 44% | RIOGRANDE | 9 | River that flows from Colorado to the Gulf of Mexico: 2 wds. |
| 44% | ORONTES | 7 | River that flows north from Lebanon to Syria |
| 39% | DON | 3 | River that rises in the Cairngorm Mountains before flowing east to the North Sea |
| 38% | DART | 4 | River in Devon that flows into the English Channel at Dartmouth |
| 38% | AARE | 4 | River that flows from the Bernese Alps |
| 37% | LENA | 4 | River in Russia that rises in Siberia before flowing to the Laptev Sea |
| 37% | GODAVARI | 8 | River rising in Maharashtra, India sacred to Hindus that flows to the Bay of Bengal |
| 37% | MAIN | 4 | River in Germany that flows through Wurzburg to the Rhine |
| 37% | NILE | 4 | River that flows south to north |
| 37% | NILE | 4 | River that flows in East Africa |
| 36% | EBRO | 4 | River in Spain that flows to the Mediterranean southwest of Tarragona |
| 36% | UGIE | 4 | River in Scotland that flows to the North Sea at Peterhead |
| 36% | WESER | 5 | River in Germany that flows to the North Sea at Bremerhaven |
| 36% | URAL | 4 | River that flows to the Caspian Sea |
| 36% | STOUR | 5 | River in Kent that flows into the English Channel at Pegwell Bay |
| 36% | OUSE | 4 | River in England that flows to the Wash near King's Lynn |
| 36% | YARRA | 5 | River in Victoria, Australia that flows westward to Melbourne |
| 36% | WYRE | 4 | River that flows into Morecambe Bay at Fleetwood |
| 36% | XINGU | 5 | River in Brazil that rises on the Mato Grosso plateau before flowing north to the Amazon delta |
| 35% | SPEY | 4 | River in Scotland that flows through the Grampian Mountains to the Moray Firth |
| 35% | DRIN | 4 | River rising in Macedonia that flows through Albania to the Adriatic |
| 35% | ADIGE | 5 | River in North Italy that flows to the Adriatic via Verona |
| 35% | ADIGE | 5 | River in N Italy that flows to the Adriatic via Verona |
| 35% | ADIGE | 5 | River in northern Italy that flows to the Adriatic via Verona |
| 35% | SAVA | 4 | River rising in Slovenia that flows to the Danube at Belgrade |