Boasting more cabins than any other vessel afloat and with room for 6,680 passengers, the just-launched, 228,081-ton Symphony of the Seas is the world’s largest ocean liner.

She’s a slightly larger version of the third ship in Royal Caribbean’s Oasis Class, the 22-month-old Harmony of the Seas. Harmony, in turn, was a bit bigger than the first two Oasis Class vessels, Oasis of the Seas and Allure of the Seas.

Designed for vacationers who love big, bustling mega-resorts, the Oasis Class vessels have made waves in the cruise industry since they began debuting in 2009. All of the Oasis Class ships currently at sea are in excess of 225,000 tons — more than 30 percent larger than the next biggest cruise vessels.

Royal Caribbean CEO Michael Bayley says the line’s focus is on building vessels with an ever-growing array of attractions and activities for vacationers – and this inevitably results in ever-bigger ships. “We design for maximum fun, entertainment and vacation experience, and end up with big ships.”

Symphony eclipses Harmony by more than 1,000 tons and offers several new features including a revamped Boardwalk amusement area and a new laser tag attraction. The ship also has a first-of-its-kind, two-deck-high family suite with a slide between floors.

The ship was built at the giant STX France shipyard in St. Nazaire, France – the same shipyard that built Harmony.

Symphony will spend her first few months sailing in the Mediterranean out of Barcelona before moving to Miami to operate cruises to the Caribbean.

She won’t be the world’s biggest cruise ship for long. Bayley says a new vessel scheduled for launching in 2021 will be even bigger.