| 100% | AVE | 3 | 52 mile long Portuguese river that flows into the Atlantic at Vila do Conde |
| 46% | ORB | 3 | Beziers' 84 mile long river that flows into the Mediterranean at Valras-Plage |
| 41% | PARNAIBA | 8 | Brazilian river that flows into the Atlantic Ocean |
| 40% | TAGUS | 5 | River that flows to the Atlantic at Lisbon, Portugal |
| 40% | TEES | 4 | River that flows into the North Sea at Middlesbrough |
| 35% | SIRET | 5 | 402 mile long Romanian river that meets the Danube at Galati |
| 35% | DART | 4 | River in Devon that flows into the English Channel at Dartmouth |
| 35% | STOUR | 5 | River in Kent that flows into the English Channel at Pegwell Bay |
| 35% | VOLGA | 5 | Longest river in Europe that flows into the Caspian Sea |
| 34% | OSAGE | 5 | River that flows into the Lake of the Ozarks |
| 34% | CHERWELL | 8 | Oxfordshire river that flows into the Thames |
| 34% | AAR | 3 | Swiss river that flows into the Rhine (Var.) |
| 34% | ILLER | 5 | River that flows into the Danube in the center of Ulm |
| 33% | DANUBE | 6 | Major European river that flows into the Black Sea |
| 33% | OUSE | 4 | 143 mi. British river that flows into the Wash |
| 33% | SAL | 3 | 482 mi. long river that flows into the Don and rises near the city of Elista in Kalmykia, Russia |
| 32% | WYRE | 4 | River that flows into Morecambe Bay at Fleetwood |
| 32% | OISE | 4 | 212 mi. river that flows into the Seine in the suburbs of Paris |
| 31% | TAFF | 4 | River that flows to the Bristol Channel at Cardiff |
| 31% | WEAR | 4 | River that flows to the North Sea at Sunderland |
| 31% | TEES | 4 | River that flows to the North Sea at Middlesbrough |
| 31% | MURRAY | 6 | River rising in New South Wales, Australia, that flows into the sea at Encounter Bay |
| 30% | URAL | 4 | Russian river that flows to the Caspian Sea at Guryev |
| 29% | YSER | 4 | River rising in northern France that flows through Belgium into the North Sea at Nieuwpoort |
| 29% | ELBE | 4 | 380 mile central European river that flows to the North Sea |
| 29% | TYNE | 4 | English river that flows to the North Sea at South Shields |
| 29% | PECOS | 5 | River from New Mexico that flows into the Rio Grande |
| 28% | SOR | 3 | 30 mile long river that's the only salmon river in Galicia |
| 28% | ELDE | 4 | 140 mi. German river that flows out of the Plauer See and joins the Elbe at Domitz |
| 28% | SNOWY | 5 | — River, stream that flows into the Bass Strait near Orbost, Victoria, Australia |