Related Clues:

• Atlas dot
• Cay
• Key
• A-test site, perhaps
• Capri, e.g.
• Guernsey, for one
• Bikini, e.g.
• Ring around a lagoon
• Dot on a map
• Reinforce, with 'up'
• Ferry terminus, maybe
• Vacation spot, perhaps
• Coast
• Any of the Antilles
• Reef, maybe