| River famously crossed by Caesar | 32 |
| River explored by V. L. Cameron et al. | 38 |
| River explored by David Livingstone | 35 |
| River dividing Germany and Poland | 33 |
| River deliberately flooded in W.W. I | 36 |
| River crossing France's Nord department | 43 |
| River crossed by the Ponte Vecchio | 34 |
| River crossed by the Pont d'Avignon | 39 |
| River crossed by the North Beacon Bridge | 40 |
| River crossed by the Longfellow Bridge | 38 |
| River crossed by Allied forces in February 1945 | 47 |
| River crossed by a ferry in a 1965 top 10 hit | 45 |
| River connected to a 165-mile long European canal | 49 |
| River connected by canal to the Volga | 37 |
| River connected by canal to the Tiber | 37 |
| River connected by canal to the Don | 35 |
| River called Liger by the ancients | 34 |
| River called Hiddekil in the Bible | 34 |
| River called "Big Muddy" | 34 |
| River by the Royal Shakespeare Theatre | 38 |
| River bridged by the Ponte Vecchio | 34 |
| River between two Midwestern states | 35 |
| River between Texas and Louisiana | 33 |
| River between Spain and Portugal | 32 |
| River between Poland and E. Germany | 35 |
| River between Ontario and Quebec | 32 |
| River between Manchuria and U.S.S.R. | 36 |
| River between Manchuria and the U.S.S.R. | 40 |
| River between Lake Erie and Lake Ontario | 40 |
| River between Germany and Poland | 32 |
| River between Devon and Cornwall | 32 |
| River between China and North Korea | 35 |
| River between Argentina and Uruguay | 35 |
| River beside the Royal Shakespeare Theatre | 42 |
| River beneath the Brooklyn Bridge | 33 |
| River beneath the 6th October Bridge | 36 |
| River around the Île de la Cité | 37 |
| River areas named for their shape | 33 |
| River alongside the Royal Shakespeare Theatre | 45 |
| River alongside King's College | 34 |
| River along the Zambia-Zimbabwe border | 38 |
| River along the Quai d'Orsay | 32 |
| River along the China/Korea border | 34 |
| River across the French/German border | 37 |
| River across Manhattan from the Hudson | 38 |
| Rive Gauche and Rive Droite separator | 37 |
| Rivals for the folks' attention, maybe | 42 |
| Rivals for parental attention, perhaps | 38 |
| Rivaling actress Adams in intelligibility? | 42 |
| Rival site that launched before YouTube | 39 |
| Rival school of The Citadel: Abbr. | 34 |
| Rival of Velma in "Chicago" | 37 |
| Rival of the Small-Scale Experimental Machine | 45 |
| Rival of Smell-O-Vision, in Hollywood | 37 |
| Rival of Roach in early film comedy | 35 |
| Rival of Pringles made by Lay's | 35 |
| Rival of Olga at the 1976 Olympics | 34 |
| Rival of George and Bill in '92 | 35 |
| Rival of Delta and American: Abbr. | 34 |
| Rival of Dad's and Barq's | 33 |
| Rival of Canisius in college sports | 35 |
| Rival of California Pizza Kitchen | 33 |
| Rival of Billie Jean and Martina | 32 |
| Rival of Bali and Lily of France | 32 |
| Rival of Apollo for Marpessa's love | 39 |
| Ritzy jeweler Van ___ & Arpels | 34 |
| Rituals when "Dayenu" is sung | 39 |
| Rituals including the Cup of Elijah | 35 |
| Ritual on ''Survivor'' | 38 |
| Ritual in which bitter herbs are dipped | 39 |
| Ritual favorite written by Mendelssohn | 38 |
| Ritual before a fall, hopefully? | 32 |
| Rites of Spring and Fall Out Boy | 32 |
| Rite reading for some 13-year-olds | 34 |
| Rite place to sing Christmas songs? | 35 |
| Rite performed on the eighth day of life | 40 |
| Rite of passage participant, often | 34 |
| Ritchie who sang "Donna" | 34 |
| Ritchie Valens or Bob Marley tune | 33 |
| Ritchie Valens "La ___" | 33 |
| Ritchard who played Hook on Broadway | 36 |
| Rita's "West Side Story" role | 43 |
| Rita Ora song "Stay ___" | 34 |
| Rita of "West Side Story" | 35 |
| Rita of "The Electric Company" | 40 |
| Rita of "Carnal Knowledge" | 36 |
| Rita of 'West Side Story' | 33 |
| Rita in "West Side Story" | 35 |
| Rita Hayworth/Victor Mature musical | 35 |
| Rita Hayworth's third husband | 33 |
| Rita Hayworth title role of 1946 | 32 |
| Ristorante's "in the style of" | 44 |
| Risky thing to try in figure skating | 36 |
| Risky thing to try for on "Jeopardy!" | 47 |
| Risky person to do business with, briefly | 41 |
| Risky job in the king's court | 33 |
| Risky investment opportunity, for short | 39 |
| Risky Florida city to retire to? | 32 |
| Risktaker's challenging words | 33 |
| Risks being caught in a radar trap | 34 |