5. Oasis of the Seas
When it initially entered service in 2009, the Oasis of the Seas, the first of Royal Caribbean’s Oasis-class cruise ships, was the world’s largest cruise ship. She is the world’s fifth largest cruise ship. Royal Caribbean Cruise Lines holds all five of the top spots.
The Oasis of the Seas is 361.6 meters long overall, 72 meters tall above the waterline, and 22.55 meters deep, with a gross tonnage of 225,282.