Related Clues:

• Mariner's peril
• Windstorm
• Diver's place
• Site of a wreck, perhaps
• Where a yacht might run aground
• Ocean obstacle
• Violent weather
• Sea hazard
• Snorkeling destination, perhaps
• A kind of knot
• Boating hazard
• Great Barrier, e.g.
• Cyclone
• Site of a shipwreck, perhaps
• Shore border built up by waves and currents