Related Clues:

• Lagoon surrounder
• Ridge
• Boat bottom bumper
• Atoll component
• Shipwreck cause
• Shipwreck cause, sometimes
• Water hazard
• Snorkeler's haunt
• Offshore hazard
• Part of a sail
• Snorkeling site
• Marine formation
• Snorkeling locale
• Coral construction
• Natural breakwater