| 100% | LENA | 4 | River in Russia that rises in Siberia before flowing to the Laptev Sea |
| 62% | DNIEPER | 7 | River rising in Russia near Smolensk that flows south to the Black Sea |
| 62% | DON | 3 | River that rises in the Cairngorm Mountains before flowing east to the North Sea |
| 55% | XINGU | 5 | River in Brazil that rises on the Mato Grosso plateau before flowing north to the Amazon delta |
| 55% | DNIEPER | 7 | River rising in Russia near Smolensk which flows south to the Black Sea |
| 53% | INDUS | 5 | River rising in SW Tibet that flows southwest across Pakistan to the Arabian Sea |
| 53% | INDUS | 5 | River rising in SW Tibet that flows south-west across Pakistan to the Arabian Sea |
| 53% | SAVA | 4 | River rising in Slovenia that flows to the Danube at Belgrade |
| 49% | DRIN | 4 | River rising in Macedonia that flows through Albania to the Adriatic |
| 49% | SIRET | 5 | River rising in Ukraine that flows through Romania to the Danube |
| 49% | UGIE | 4 | River in Scotland that flows to the North Sea at Peterhead |
| 49% | WESER | 5 | River in Germany that flows to the North Sea at Bremerhaven |
| 49% | SAN | 3 | River rising in Ukraine that flows across SE Poland to the Vistula |
| 49% | SAN | 3 | River rising in Ukraine that flows across southeast Poland to the Vistula |
| 48% | ORD | 3 | River in Western Australia that flows north to the Timor Sea |
| 47% | DEE | 3 | River in North Wales and Cheshire that flows to the Irish Sea |
| 47% | ELBE | 4 | River in central Europe that flows to the North Sea at Hamburg |
| 47% | GODAVARI | 8 | River rising in Maharashtra, India sacred to Hindus that flows to the Bay of Bengal |
| 47% | EMS | 3 | River rising in NW Germany that flows into the North Sea near Emden |
| 47% | TYNE | 4 | River in N England that flows to the North Sea at South Shields |
| 46% | SAAR | 4 | River rising in the Vosges Mountains that flows north to the Moselle in Germany |
| 46% | SAINTMAURICE | 12 | River rising in Quebec, Canada, that flows to the St Lawrence at Trois-Rivieres |
| 46% | ORD | 3 | River in Western Australia that flows north to Cambridge Gulf and the Timor Sea |
| 46% | SAAR | 4 | River rising in the Vosges Mountains that flows north to the Moselle River in Germany |
| 46% | YSER | 4 | River rising in northern France that flows through Belgium into the North Sea at Nieuwpoort |
| 46% | MURRAY | 6 | River rising in New South Wales, Australia, that flows into the sea at Encounter Bay |
| 46% | URAL | 4 | River that flows to the Caspian Sea |
| 45% | SUWANNEE | 8 | US river rising in the Okefenokee Swamp on the Georgia-Florida border that flows to the Gulf of Mexico |
| 45% | SPEY | 4 | River in Scotland that flows through the Grampian Mountains to the Moray Firth |
| 45% | WEAR | 4 | River that flows to the North Sea at Sunderland |