Harmony of the Seas Slides You'll find four slides onboard Harmony of the Seas, including Royal Caribbean's first dry slide, the Ultimate Abyss, a 10-story slide that starts on Deck 16, twists and turns through 10 decks and dumps you out on the Boardwalk below.

Harmony of the Seas features a total of three primary high-speed water slides and one massive dry slide. The water slide trio is known as "The Perfect Storm," consisting of two racing slides named Cyclone and Typhoon, and a third slide called Supercell which features a "champagne bowl" that swirls riders around before they drop into the exit. In addition to these water-based thrills, the ship is home to the Ultimate Abyss, which is the tallest slide at sea. While it is a "dry" slide (ridden on a mat), it drops riders 10 stories from the Pool and Sports Zone down to the Boardwalk. For younger children, the Splashaway Bay aqua park provides several smaller, kid-friendly slides and water features. While newer ships like Icon of the Seas have larger dedicated water parks, the three-slide "Perfect Storm" remains a signature thrill for passengers on the Oasis-class Harmony.