| River in Indiana's state song | 33 |
| River in New York and Pennsylvania | 34 |
| River in the title of a 1957 Alec Guinness film | 47 |
| River in view in "Room With a View" | 45 |
| River in which Achilles was dipped | 34 |
| River in which Rasputin was thrown | 34 |
| River including Livingstone Falls | 33 |
| River intentionally flooded in W.W. I | 37 |
| River into which Rasputin was thrown | 36 |
| River into which the Big Sandy flows | 36 |
| River into which the Fulda flows | 32 |
| River into which the Great Miami flows | 38 |
| River into which the Kentucky flows | 35 |
| River into which the Vltava flows | 33 |
| River joining the Missouri near Jefferson City | 46 |
| River just south of the Central African Republic | 48 |
| River known anciently as Obringa | 32 |
| River known for disastrous floods | 33 |
| River known for the goldfields in its basin | 43 |
| River known in ancient times as Obringa | 39 |
| River known to the ancients as Obringa | 38 |
| River leading to the Caspian Sea | 32 |
| River near Anne Hathaway's cottage | 38 |
| River near lots of lovely castles, to the Germans | 49 |
| River of Belgium's West Flanders | 36 |
| River of central Italy, to locals | 33 |
| River of England's East Midlands | 36 |
| River of Germany's steel-making region | 42 |
| River of Germany's steelmaking region | 41 |
| River of Hades with a ferry service | 35 |
| River of Shakespeare's Stratford | 36 |
| River of southern British Columbia | 34 |
| River of the Saskatchewan badlands | 34 |
| River of the underworld, in myth | 32 |
| River of Wagner's "Ring" | 38 |
| River on French-Belgian boundary | 32 |
| River on North Korea's border | 33 |
| River on Switzerland's border | 33 |
| River on the China/North Korea border | 37 |
| River on the North Korea/China border | 37 |
| River on the Texas/Louisiana border | 35 |
| River or Gershwin's first big hit | 37 |
| River originating in the Savoy Alps | 35 |
| River originating near Winterberg | 33 |
| River plains named for their usual shape | 40 |
| River probably discovered by Columbus in 1498 | 45 |
| River pronounced "waz" | 32 |
| River rising in the Ardennes Mountains | 38 |
| River rising in the Bernese Alps | 32 |
| River rising in the Cantabrian Mountains | 40 |
| River rising in the Rocky Mountains | 35 |
| River rising in the Vosges Mountains | 36 |
| River rising through the Bernese Alps | 37 |
| River seen from Ciudad BolÃvar | 33 |
| River seen from the Eiffel Tower | 32 |
| River separating Germany and Poland | 35 |
| River separating Ontario and Quebec | 35 |
| River separating Queens from the Bronx | 38 |
| River spanned by the Bagnell Dam | 32 |
| River spanned by the Brooklyn Bridge | 36 |
| River spanned by the Ponte Vecchio | 34 |
| River spanned by the Three Gorges Dam | 37 |
| River straddled by Basel, Switzerland | 37 |
| River target of the first Egyptian plague | 41 |
| River that can be seen from the Uffizi Gallery | 46 |
| River that causes people to forget | 34 |
| River that drains more than 20% of France | 41 |
| River that drains the Lake of Thun | 34 |
| River that drains the western Pyrenees | 38 |
| River that empties into the Bering Sea | 38 |
| River that empties into the Caspian | 35 |
| River that empties into the Firth of Clyde | 42 |
| River that feeds the Caspian Sea | 32 |
| River that flooded Florence in 1966 | 35 |
| River that flows by the Hermitage | 33 |
| River that flows by the Hermitage Museum | 40 |
| River that flows into the Bay of Bengal | 39 |
| River that flows past four universities | 39 |
| River that flows past more than 40 castles | 42 |
| River that flows through Florence | 33 |
| River that flows through nine countries | 39 |
| River that flows through ten countries | 38 |
| River that flows to the Caspian Sea | 35 |
| River that forms Lake of the Ozarks | 35 |
| River that forms part of Colombia's border | 46 |
| River that forms the Livingstone Falls | 38 |
| River that goes from calm to choppy? | 36 |
| River that joins the Mississippi | 32 |
| River that lends its name to an Austrian city | 45 |
| River that meets the Thames at London | 37 |
| River that passes by Essen, Germany | 35 |
| River that passes by the Hermitage | 34 |
| River that passes through Essen, Germany | 40 |
| River that rises in Monte Falterona | 35 |
| River that rises in the Apennines | 33 |
| River that rises in the Ardennes | 32 |
| River that rises in the Bernese Alps | 36 |
| River that rises in the Vogesen Mountains | 41 |
| River that runs near the Leaning Tower of Pisa | 46 |
| River that Sherlock Holmes fell into | 36 |