Related Clues:

• Atoll, essentially
• Coral construct
• Atoll's makeup
• Dust devil, e.g.
• Oceanic swirl
• Maritime vortex
• Ship wrecker
• Whorl
• Arnold of country
• Nelson who sang "Ah! Sweet Mystery of Life"
• Shipwreck locale
• Diver's haunt
• Atoll, for one
• Coral Sea hazard
• Kayaker's obstacle