Symphony of the Seas is an Oasis-class cruise ship owned and operated by Royal Caribbean International. She is the largest passenger ship in the world by gross tonnage, at 228,021 GT, surpassing her sister Harmony of the Seas.

Symphony of the Seas was built in the 'Chantiers de l'Atlantique' shipyard in Saint Nazaire, France. She is the fourth ship in its Oasis-class series.

Symphony of the Seas measures 361.011 metres (1,184.42 ft) in length and has a gross tonnage of 228,081 across 18 decks. She is able to accommodate 5,518 passengers at double occupancy up to a maximum capacity of 6,680 passengers, as well as a 2,200-person crew. There are 16 decks for guest use, 22 restaurants, 24 pools and 2,759 cabins.

Facilities include a children's water park, a full-size basketball court, ice-skating rink, and two 43-foot rock-climbing walls. There is also a 'central park' which contains over 20,000 tropical plants.

The christening ceremony took place in Miami in November 2018. Her maiden cruise started from Barcelona, Spain on 7 April 2018 for a week-long trip through the Mediterranean.

During her first season Symphony of the Seas continued to sail on seven-night Western Mediterranean cruises from Barcelona. On 28 October 2018, she repositioned to her home port in Florida, United States to do Caribbean cruises.

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