| River flowing through Venezuela | 31 |
| River flowing through Zaragoza | 30 |
| River flowing to Rennes | 23 |
| River flowing to the Missouri | 29 |
| River flowing to the Rhine | 26 |
| River flowing to the Seine | 26 |
| River followed by the Oregon Trail | 34 |
| River followed by the Pony Express | 34 |
| River for Burns | 15 |
| River for poet Masters | 22 |
| River for some boatmen | 22 |
| River for the young Moses | 25 |
| River forest firth | 18 |
| River formation | 15 |
| River formations | 16 |
| River formed at Pittsburgh | 26 |
| River formed by the Congaree and Wateree | 40 |
| River formed by the junction of the Fulda and Werra | 51 |
| River formed near Fort Wayne | 28 |
| River forming part of Germany's eastern border | 50 |
| River forming part of the European-Asian border | 47 |
| River forming part of the Germany-Netherlands boundary | 54 |
| River forming the borders of parts of five states | 49 |
| River forming the eastern border of Charlemagne's empire | 60 |
| River forming the Handegg waterfall | 35 |
| River found in "sewer" | 32 |
| River frolicker | 15 |
| River frolickers | 16 |
| River frolicking? | 17 |
| River from Belgium to France | 28 |
| River from Dijon | 16 |
| River from Lake Erie | 20 |
| River from Lake Erie to Lake Ontario | 36 |
| River from Lake Ladoga | 22 |
| River from Lake Ontario | 23 |
| River from Lake Victoria | 24 |
| River from Pittsburgh | 21 |
| River from Pittsburgh to the Mississippi | 40 |
| River from Silesia to the Neisse | 32 |
| River from Staffordshire | 24 |
| River from Superior to Huron | 28 |
| River from the Alps | 19 |
| River from the Alps to the North Sea | 36 |
| River from the Bernese Alps | 27 |
| River from the Cairngorm Mountains | 34 |
| River from the Cantabrian Mountains | 35 |
| River from the Savoy Alps | 25 |
| River from the Vosges Mountains | 31 |
| River gamboler | 14 |
| River growth | 12 |
| River hazard | 12 |
| River hazards | 13 |
| River herring | 13 |
| River herrings | 14 |
| River horse | 11 |
| River horse, for short | 22 |
| River horse, to cockneys | 24 |
| River horses | 12 |
| River horses, for short | 23 |
| River immortalized by Burns | 27 |
| River immortalized by Smetana | 29 |
| River important in World War I | 30 |
| River important in WWI | 22 |
| River in British Columbia, or singer Anne | 42 |
| River in "Aida" | 25 |
| River in "Kubla Khan" | 31 |
| River in "The City of Lilies" | 39 |
| River in "The Divine Comedy" | 38 |
| River in a 1914 battle | 22 |
| River in a 1957 Best Picture title | 34 |
| River in a 1957 film | 20 |
| River in a 1957 film title | 26 |
| River in a 1957 hit film | 24 |
| River in a 1957 hit movie | 25 |
| River in a 1957 movie | 21 |
| River in a Best Picture title | 29 |
| River in a Burns poem | 21 |
| River in a canine's name | 28 |
| River in a Christie title | 25 |
| River in a Coleridge poem | 25 |
| River in a Pierre Boulle novel | 30 |
| River in a Robert Burns poem | 28 |
| River in a Stephen Foster song | 30 |
| River in a Stephen Foster tune | 30 |
| River in a Strauss title | 24 |
| River in a Strauss waltz | 24 |
| River in a Vachel Lindsay poem | 30 |
| River in Aberdeen | 17 |
| River in Africa | 15 |
| River in an 1851 Leutze painting | 32 |
| River in an Agatha Christie title | 33 |
| River in an old spiritual | 25 |
| River in Ariz. | 14 |
| River in Arizona | 16 |
| River in Asia | 13 |
| River in Australia | 18 |
| River in Austria and Hungary | 28 |
| River in Bavaria | 16 |
| River in Belarus crossed by Napoleon in 1812 | 44 |
| River in Belgium | 16 |