Related Clues:

• Bikini, for one
• Lagoon surrounder
• Ridge
• Boat bottom bumper
• Atoll component
• Ring-shaped reef
• Shipwreck cause
• Shipwreck cause, sometimes
• Reef ring
• Nauru, for one
• Circle at sea
• Island-hopper's stop
• Water hazard
• Lagoon encloser
• Coral reef