Related Clues:

• Reef
• Island ring
• A-test site, perhaps
• Hawaiian island
• Bikini, e.g.
• Ring around a lagoon
• Reef, maybe
• So-called 'Valley Isle'
• Wake Island, e.g.
• Coral formation
• Hawaiian isle
• Castaway's site
• It has a certain ring to it
• Haleakala National Park site
• Haleakala Crater locale