| 100% | UGIE | 4 | River in Scotland that flows to the North Sea at Peterhead |
| 77% | WESER | 5 | River in Germany that flows to the North Sea at Bremerhaven |
| 70% | ELBE | 4 | River in central Europe that flows to the North Sea at Hamburg |
| 70% | TYNE | 4 | River in N England that flows to the North Sea at South Shields |
| 67% | WEAR | 4 | River that flows to the North Sea at Sunderland |
| 67% | TEES | 4 | River that flows to the North Sea at Middlesbrough |
| 64% | TYNE | 4 | English river that flows to the North Sea at South Shields |
| 58% | ORD | 3 | River in Western Australia that flows north to Cambridge Gulf and the Timor Sea |
| 57% | TEES | 4 | River that flows into the North Sea at Middlesbrough |
| 57% | DEE | 3 | River in North Wales and Cheshire that flows to the Irish Sea |
| 56% | SPEY | 4 | River in Scotland that flows through the Grampian Mountains to the Moray Firth |
| 55% | URAL | 4 | Russian river that flows to the Caspian Sea at Guryev |
| 53% | SAVA | 4 | River rising in Slovenia that flows to the Danube at Belgrade |
| 52% | ORD | 3 | River in Western Australia that flows north to the Timor Sea |
| 52% | ELBE | 4 | 380 mile central European river that flows to the North Sea |
| 52% | DEMERARA | 8 | River in Guyana flowing north to the Atlantic at Georgetown |
| 51% | DON | 3 | River that rises in the Cairngorm Mountains before flowing east to the North Sea |
| 51% | YSER | 4 | River rising in northern France that flows through Belgium into the North Sea at Nieuwpoort |
| 51% | ADIGE | 5 | River in North Italy that flows to the Adriatic via Verona |
| 51% | TEES | 4 | River that flows through Middlesbrough to the North Sea |
| 50% | EMS | 3 | River rising in NW Germany that flows into the North Sea near Emden |
| 50% | EBRO | 4 | River in Spain that flows to the Mediterranean southwest of Tarragona |
| 49% | OUSE | 4 | River in England that flows to the Wash near King's Lynn |
| 49% | XINGU | 5 | River in Brazil that rises on the Mato Grosso plateau before flowing north to the Amazon delta |
| 49% | URAL | 4 | River that flows to the Caspian Sea |
| 48% | LENA | 4 | River in Russia that rises in Siberia before flowing to the Laptev Sea |
| 48% | VISTULA | 7 | River of Poland that flows to the Baltic Sea near Gdansk |
| 48% | RIBBLE | 6 | River that flows to the Irish Sea near Preston |
| 48% | SAINTMAURICE | 12 | River rising in Quebec, Canada, that flows to the St Lawrence at Trois-Rivieres |
| 47% | DART | 4 | River in Devon that flows into the English Channel at Dartmouth |