Reef

The term is derived from the French word récif, meaning "shallow sandbar or coral reef" in French. This word was borrowed from the Spanish arrecife, which carries the same meaning. The Spanish term originates from the Arabic root rṣf, yielding the word ar-raṣīf (الرصيف), meaning breakwater. This term is an adjective derived from the Arabic verb raṣafa (رصف), which means "to pave with stones or to construct a road."

• Geography: Used to describe rock formations and coral-based structures at or near sea level.
• Maritime Navigation: Used to denote rocky areas in shallow waters that pose a hazard to ship navigation.
• Marine Biology: Used to describe underwater and surface structures formed by corals.
• Oceanography: Used to refer to natural barriers and rows of rocks that extend to the sea surface.