Related Clues:

• It may be uncharted
• Cyprus or Malta
• See 24 Across
• Key element
• Billionaire's purchase, perhaps
• Yeats' ''The Lake ___ of Innisfree''
• Ireland or Elba
• Aruba, for one
• ___ au Haut, Maine
• Shipwrecked one's refuge
• 52-Across, e.g.
• Dot on an ocean map
• Singapore, for one
• Oahu, e.g.: Abbr.
• Oahu, for one: Abbr.