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Rio Grande
- a North American river; boundary between the United States and Mexico; flows into Gulf of Mexico
Rio Bravo
- a North American river; boundary between the United States and Mexico; flows into Gulf of Mexico
Rocky Mountains
- the chief mountain range of western North America; extends from British Columbia to northern New Mexico; forms the continental divide
Ross Sea
- an arm of the southern Pacific Ocean in Antarctica
Russell's Body
- an inclusion body found in plasma cells in cases of cancer
Russian River
- a river in northern California
River Severn
- a river in England and Wales flowing into the Bristol Channel; the longest river in Great Britain
River Styx
- (Greek mythology) a river in Hades across which Charon carried dead souls
River Thames
- the longest river in England; flows eastward through London to the North Sea