There is a total of 11158 clues beginning with ri
- River formed at Khartoum
- River formed at Pittsburgh
- River formed by Allegheny and Monongahela
- River formed by the Congaree and Wateree
- River formed by the junction of the Fulda and Werra
- River formed near Fort Wayne
- River forming estuary at Le Havre
- River forming international line
- River forming much of the Oregon-Idaho border
- River forming N Manchurian border
- River forming north border of Manchuria
- River forming part of German-Polish border
- River forming part of Germany's eastern border
- River forming part of the boundary between Europe and Asia
- River forming part of the boundary between Spain and Portugal: Span
- River forming part of the European-Asian border
- River forming part of the German-Luxembourgian border
- River forming part of the Germany-Netherlands boundary
- River forming the borders of parts of five states
- River forming the eastern border of Charlemagne's empire
- River forming the Handegg waterfall
- River forming the Swiss/Liechtenstein border
- River forming wide delta in Venezuela
- River found in "sewer"
- River Foyle's province
- River frolicker
- River frolickers
- River frolicking?
- River from Austria through Germany to the Danube
- River from Belgium to France
- River from Belgium to France
- River from Blue Ridge to Rappahannock
- River from Cantabria to Catalonia
- River from Lake Erie to Lake Ontario
- River from Lake Erie to Lake Ontario
- River from Lake Ladoga
- River from Lake Ladoga to Gulf of Finland
- River from Lake Ladoga
- River from Lake Lagoda to Gulf of Finland
- River from Lake Peipus to Gulf of Finland
- River from Lake Superior to Lake Huron
- River from Lake Victoria
- River from Mukden to North Sea
- River from New Mexico through Texas to the Rio Grande
- River from Pittsburgh
- River from Pittsburgh to the Mississippi
- River from Pittsburgh to the Mississippi
- River from Pittsburgh, Pennsylvania, to Cairo, Illinois
- River from Pyrenees to Bay of Biscay
- River from Staffordshire
- River from Superior to Huron
- River from the Alps
- River from the Alps to the North Sea
- River from the Alps to the Rhine
- River from the Alps to the Rhone
- River from the Appalachians
- River from the Bernese Alps
- River from the Cairngorm Mountains
- River from the Cantabrian Mountains
- River from the Carpathians to the Baltic
- River from the Graian Alps
- River from the Jura Mts to the Rhone
- River from the Pyrenees to the Ebro
- River from the Rockies to the Rio Grande
- River from the Savoy Alps
- River from the Vosges Mountains
- River from the Vosges to the Moselle
- River from the Vosges to the Moselle: Fr
- River from the White Mountains
- River from Tibet to Shanghai
- River fronting the Quai Saint-Michel
- River gamboler
- River generating hydroelectric power in Ghana
- River giant
- River god of Argolis
- River gulch
- River hazard
- River hazard
- River hazards
- River herring
- River herrings
- River homes
- River horse
- River horse, for short
- River horse, to cockneys
- River horses
- River horses, for short
- River immortalized by Burns
- River immortalized by Smetana
- River immortalized by Strauss
- River important in World War I
- River important in WWI
- River in "Aida"
- River in "Green Mansions"
- River in "houseboy"?
- River in "Kubla Khan"
- River in "Kubla Khan"
- River in "Shenandoah's" lyrics
- River in "The City of Lilies"
- River in "The Divine Comedy"