Related Clues:

• Reef deposit
• Type of knot
• Coral habitat
• Snorkler's interest
• Snorkeling spot
• Mariner's peril
• Diver's place
• Site of a wreck, perhaps
• Where a yacht might run aground
• Ocean obstacle
• Sea hazard
• Ocean-reef material
• Snorkeling destination, perhaps
• A kind of knot
• Boating hazard