Related Clues:

• Coral reef border islands
• Lagoons' surroundings
• Marshall Islands, e.g.
• Ring-shaped coral islands
• Coral structures
• Caribbean getaways
• Coral rings
• Bikini et al.
• Great Barrier Reef phenomena
• Reef rings
• Ring-shaped reefs
• Much of Oceania
• Ocean rings
• Coral islands
• Bikini, et cetera