MS Harmony of the Seas is an Oasis-class cruise ship built by STX France at the Chantiers de l'Atlantique shipyard in Saint-Nazaire, France for Royal Caribbean International. With a gross tonnage of 226,963 GT, she is the second largest passenger ship in the world, surpassing her older sisters Oasis of the Seas and Allure of the Seas, but surpassed by her newer sister Symphony of the Seas.

Can we conclude that is harmony of the seas the biggest cruise ship in the world?
no