| 100% | EBRO | 4 | River in Spain that flows to the Mediterranean southwest of Tarragona |
| 50% | SWAN | 4 | River in southwest Australia that flows to the Indian Ocean below Perth |
| 50% | UGIE | 4 | River in Scotland that flows to the North Sea at Peterhead |
| 50% | WESER | 5 | River in Germany that flows to the North Sea at Bremerhaven |
| 49% | OUSE | 4 | River in England that flows to the Wash near King's Lynn |
| 46% | MAIN | 4 | River in Germany that flows through Wurzburg to the Rhine |
| 46% | SPEY | 4 | River in Scotland that flows through the Grampian Mountains to the Moray Firth |
| 46% | SAVA | 4 | River rising in Slovenia that flows to the Danube at Belgrade |
| 45% | INDUS | 5 | River rising in SW Tibet that flows southwest across Pakistan to the Arabian Sea |
| 45% | GODAVARI | 8 | River rising in Maharashtra, India sacred to Hindus that flows to the Bay of Bengal |
| 44% | VISTULA | 7 | River of Poland that flows to the Baltic Sea near Gdansk |
| 43% | ILLER | 5 | River that flows into the Danube in the center of Ulm |
| 43% | ADIGE | 5 | River in North Italy that flows to the Adriatic via Verona |
| 43% | ADIGE | 5 | River in N Italy that flows to the Adriatic via Verona |
| 43% | ADIGE | 5 | River in northern Italy that flows to the Adriatic via Verona |
| 43% | ORD | 3 | River in Western Australia that flows north to Cambridge Gulf and the Timor Sea |
| 43% | AVON | 4 | River of central England that flows to the River Severn at Tewkesbury |
| 43% | ELBE | 4 | River in central Europe that flows to the North Sea at Hamburg |
| 43% | SWAN | 4 | River in SW Australia that flows to the Indian Ocean below Perth |
| 43% | RIO | 3 | ___ Grande (river that flows to the Gulf of Mexico) |
| 42% | URE | 3 | River of North Yorkshire that flows to the Swale to form the Ouse |
| 42% | TYNE | 4 | River in N England that flows to the North Sea at South Shields |
| 42% | DRIN | 4 | River rising in Macedonia that flows through Albania to the Adriatic |
| 42% | SIRET | 5 | River rising in Ukraine that flows through Romania to the Danube |
| 42% | SAN | 3 | River rising in Ukraine that flows across SE Poland to the Vistula |
| 42% | SAN | 3 | River rising in Ukraine that flows across southeast Poland to the Vistula |
| 42% | RIOGRANDE | 9 | River that flows from Colorado to the Gulf of Mexico: 2 wds. |
| 42% | XINGU | 5 | River in Brazil that rises on the Mato Grosso plateau before flowing north to the Amazon delta |
| 41% | DEE | 3 | River in North Wales and Cheshire that flows to the Irish Sea |
| 40% | AMAZON | 6 | ___ River, waterbody in South America that is central to a rainforest of the same name |