| 100% | NEISSE | 6 | River rising in SW Poland that joins the Oder near Brzeg |
| 88% | NEISSE | 6 | River rising in southwest Poland that joins the Oder near Brzeg |
| 78% | NEISSE | 6 | River rising in southwest Poland that joins the Odra near Brzeg |
| 52% | NEOSHO | 6 | US river rising in Kansas that joins the Arkansas River near Muskogee, Oklahoma |
| 47% | INDUS | 5 | River rising in SW Tibet that flows southwest across Pakistan to the Arabian Sea |
| 46% | INDUS | 5 | River rising in SW Tibet that flows south-west across Pakistan to the Arabian Sea |
| 46% | SAN | 3 | River rising in Ukraine that flows across SE Poland to the Vistula |
| 46% | SAN | 3 | River rising in Ukraine that flows across southeast Poland to the Vistula |
| 45% | DNIEPER | 7 | River rising in Russia near Smolensk that flows south to the Black Sea |
| 44% | NECKAR | 6 | German river rising in the Black Forest that joins the Rhine at Mannheim |
| 44% | EMS | 3 | River rising in NW Germany that flows into the North Sea near Emden |
| 43% | YELLOWSTONE | 11 | US river rising in NW Wyoming that enters the Missouri near the North Dakota border |
| 42% | SAN | 3 | & 15D River rising in the Sierra Nevada that forms a large delta with the Sacramento River near Suisun Bay |
| 42% | UCAYALI | 7 | River in Peru that joins the Maranon River near the town of Nauta |
| 40% | ARUWIMI | 7 | River in the NE Democratic Republic of Congo that rises near Lake Albert as the Ituri |
| 39% | GILA | 4 | River that joins the Colorado near Yuma |
| 39% | DRIN | 4 | River rising in Macedonia that flows through Albania to the Adriatic |
| 39% | SAVA | 4 | River rising in Slovenia that flows to the Danube at Belgrade |
| 39% | SIRET | 5 | River rising in Ukraine that flows through Romania to the Danube |
| 38% | SAL | 3 | 482 mi. long river that flows into the Don and rises near the city of Elista in Kalmykia, Russia |
| 38% | DNIEPER | 7 | River rising in Russia near Smolensk which flows south to the Black Sea |
| 38% | MAMORE | 6 | River rising in the Andes that forms part of the Bolivia-Brazil border |
| 37% | SAAR | 4 | River rising in the Vosges Mountains that flows north to the Moselle in Germany |
| 37% | SAONE | 5 | River in E France that joins the Rhone at Lyon |
| 37% | SAAR | 4 | River rising in the Vosges Mountains that flows north to the Moselle River in Germany |
| 37% | ORANGE | 6 | River rising in the Drakensberg mountains that forms the boundary between South Africa and Namibia |
| 37% | MURRAY | 6 | River rising in New South Wales, Australia, that flows into the sea at Encounter Bay |
| 37% | GODAVARI | 8 | River rising in Maharashtra, India sacred to Hindus that flows to the Bay of Bengal |
| 37% | SAINTMAURICE | 12 | River rising in Quebec, Canada, that flows to the St Lawrence at Trois-Rivieres |
| 37% | ARUWIMI | 7 | River in NE Democratic Republic of the Congo that rises near Lake Albert as the Ituri |