Related Clues:

• Coral rings
• Bikini et al.
• Reef rings
• Ring-shaped reefs
• Much of Oceania
• Coral islands
• Bikini, et cetera
• Bikini, etc.
• Ring islands
• Coral Sea features
• Snorkeling sites
• Ring-shaped coral reefs
• They enclose lagoons
• Snorkeling spots
• Lagoon enclosers