| 100% | SNOWY | 5 | — River, stream that flows into the Bass Strait near Orbost, Victoria, Australia |
| 41% | EMS | 3 | River rising in NW Germany that flows into the North Sea near Emden |
| 40% | MOISIE | 6 | River in Quebec, Canada, that flows into the St Lawrence River near Sept-Iles |
| 39% | OSAGE | 5 | River that flows into the Lake of the Ozarks |
| 39% | TEES | 4 | River that flows into the North Sea at Middlesbrough |
| 38% | ILLER | 5 | River that flows into the Danube in the center of Ulm |
| 38% | TRIBUTARY | 9 | River or stream that flows into a larger river |
| 38% | SAL | 3 | 482 mi. long river that flows into the Don and rises near the city of Elista in Kalmykia, Russia |
| 38% | CHERWELL | 8 | Oxfordshire river that flows into the Thames |
| 37% | PARNAIBA | 8 | Brazilian river that flows into the Atlantic Ocean |
| 37% | AAR | 3 | Swiss river that flows into the Rhine (Var.) |
| 37% | MURRAY | 6 | River rising in New South Wales, Australia, that flows into the sea at Encounter Bay |
| 36% | DART | 4 | River in Devon that flows into the English Channel at Dartmouth |
| 36% | RIBBLE | 6 | River that flows to the Irish Sea near Preston |
| 36% | DANUBE | 6 | Major European river that flows into the Black Sea |
| 36% | STOUR | 5 | River in Kent that flows into the English Channel at Pegwell Bay |
| 36% | PECOS | 5 | River from New Mexico that flows into the Rio Grande |
| 35% | YANGTZE | 7 | River that flows to the East China Sea near Shanghai, China |
| 35% | VOLGA | 5 | Longest river in Europe that flows into the Caspian Sea |
| 35% | OUSE | 4 | 143 mi. British river that flows into the Wash |
| 34% | OISE | 4 | 212 mi. river that flows into the Seine in the suburbs of Paris |
| 34% | RANCE | 5 | River in NW France that flows into the English Channel between Dinard and Saint-Malo |
| 33% | VISTULA | 7 | River of Poland that flows to the Baltic Sea near Gdansk |
| 33% | OUSE | 4 | River in England that flows to the Wash near King's Lynn |
| 33% | YARRA | 5 | River in Victoria, Australia that flows westward to Melbourne |
| 33% | CHAUTAUQUA | 10 | New York lake that flows into the Allegheny |
| 32% | AVE | 3 | 52 mile long Portuguese river that flows into the Atlantic at Vila do Conde |
| 32% | ORB | 3 | Beziers' 84 mile long river that flows into the Mediterranean at Valras-Plage |
| 32% | SWAN | 4 | River in SW Australia that flows to the Indian Ocean below Perth |
| 32% | SWAN | 4 | River in southwest Australia that flows to the Indian Ocean below Perth |