| 100% | LACHLAN | 7 | River in SE Australia; main tributary of the Murrumbidgee |
| 65% | IRTYSH | 6 | Main tributary of the Ob River in Russia |
| 53% | PASHA | 5 | Tributary of the Svir River in NW Russia |
| 51% | WHOTHEHELLKNOWS | 15 | Left tributary of the Vitim River in Irkutsk Oblast, Russia |
| 50% | RUHR | 4 | River in Germany, a tributary of the Rhine |
| 50% | GRANTA | 6 | Local name for the longer of two main tributaries of the River Cam in eastern England |
| 50% | SHATTALARAB | 11 | River in SE Iraq formed by the confluence of the Tigris and Euphrates Rivers |
| 50% | WHARFE | 6 | Tributary of the River Ouse in West and North Yorkshire upon which Ilkley stands |
| 49% | BRENT | 5 | Major tributary of the River Thames rising in the London Borough of Barnet |
| 49% | MOHAWK | 6 | Largest tributary of the Hudson River in the state of New York, US |
| 47% | VYATKA | 6 | River in Russia, a tributary of the Kama River upon which Kotelnich stands |
| 45% | PLATTE | 6 | — River, tributary of the Missouri in Nebraska, US, upon which Fremont stands |
| 45% | MARNE | 5 | Tributary of the river Seine |
| 45% | GILA | 4 | Tributary of the Colorado River |
| 45% | EBOLA | 5 | Tributary of the Congo River |
| 45% | OSAGE | 5 | Tributary of the Missouri River |
| 44% | PLATTE | 6 | — River, tributary of the Missouri in Nebraska, US, upon which Lexington and Fremont stand |
| 44% | FREMANTLE | 9 | Seaport in Western Australia at the mouth of the Swan River |
| 44% | MONMOUTH | 8 | Town in SE Wales near the border with England at the confluence of the Rivers Wye and Monnow |
| 44% | IRTYSH | 6 | Main tributary of Siberia's Ob River |
| 43% | PEEBLES | 7 | Town in SE Scotland on the banks of the River Tweed on the edge of which stands Neidpath Castle |
| 43% | MARNE | 5 | River in France which is a tributary of the Seine |
| 43% | YARROW | 6 | Tributary of the River Douglas skirting Chorley, Lancashire |
| 43% | DERWENT | 7 | Tributary of the River Trent upon which Derby stands |
| 43% | CHERWELL | 8 | Tributary of the River Thames that flows through Oxford |
| 43% | ALSTER | 6 | Tributary of the Elbe and two lakes in Hamburg |
| 43% | OTTAWA | 6 | Chief tributary of the St. Lawrence River |
| 43% | GILA | 4 | Much depleted tributary of the Colorado River |
| 43% | HOOGHLY | 7 | Westernmost tributary of the Ganges in Bengal |
| 42% | OSAGE | 5 | — River, tributary of the Missouri River in the US that flows into the Lake of the Ozarks reservoir |