Related Clues:

• Site of a wreck, perhaps
• Where a yacht might run aground
• Ocean obstacle
• Sea hazard
• Snorkeling destination, perhaps
• A kind of knot
• Boating hazard
• Great Barrier, e.g.
• Site of a shipwreck, perhaps
• Lagoon creator
• Floating hazard
• It might be just below the surface
• Glacial marine threat
• Type of lettuce
• Coral group