See the 6 private islands in the Caribbean owned by cruise lines with amenities like water parks, luxury villas, and private beaches

Thrill Waterpark at Perfect Day at CocoCay.

Brittany Chang/Insider

• Cruise lines don't just own big boats — they also own private islands in places like the Bahamas and Belize.
• The properties have proven valuable for cruise lines like Carnival, its CEO said in March.
• See photos of the 6 private islands owned by Royal Caribbean, Carnival, MSC, and Disney. 

1. Castaway Cay, Disney Cruise Line

David Roark/Disney Cruise Line

Disney Cruise Line signed...