Possible Clues:

• They're above sea level
• Aegean sights
• Can Leslie be a little of 21 across?
• Is the boy in the water with them, just a little?
• Some refueling spots
• One gets less from one of them in Scotland
• Is the boy a little in the water for them?
• Hebrides, perhaps
• Spots in the Caribbean
• Castaways' homes