Related Clues:

• Key rings?
• Many of the Marshall Islands
• The Maldives, e.g.
• A lot of Polynesia
• Island rings
• Lagoon surrounders
• Enewetak and Kwajalein
• A lot of Oceania
• Coral formations
• Coral isles
• Lagoons' surroundings
• Marshall Islands, e.g.
• Ring-shaped coral islands
• Coral structures
• Coral rings