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Rappahannock River
- a river that flows across eastern Virginia into the Tidewater region
Ravine
- a deep narrow steep-sided valley (especially one formed by running water)
- gorge
Ravines
- a deep narrow steep-sided valley (especially one formed by running water)
- gorge
Red River
- a tributary of the Mississippi River that flows eastward from Texas along the southern boundary of Oklahoma and through Louisiana
Red Dwarf
- a small, old, relatively cool star; approximately 100 times the mass of Jupiter
- a small cool star; approximately 100 times the mass of Jupiter
Red Dwarf Star
- a small, old, relatively cool star; approximately 100 times the mass of Jupiter
- a small cool star; approximately 100 times the mass of Jupiter
Red Giant
- a large, old, luminous star; has a relatively low surface temperature and a diameter large relative to the sun
- a large cool star; has a relatively low surface temperature and a diameter large relative to the sun
Red Giant Star
- a large, old, luminous star; has a relatively low surface temperature and a diameter large relative to the sun
- a large cool star; has a relatively low surface temperature and a diameter large relative to the sun
Red Sea
- a long arm of the Indian Ocean between northeast Africa and Arabia; linked to the Mediterranean at the north end by the Suez Canal
Relaxer
- any agent that produces relaxation; "music is a good relaxer"