Norwegian Cruise Line’s next ship will have one of the most elaborate spa and fitness complexes at sea — a sprawling, two-deck temple to relaxation that will feature what’s billed as the first salt room on a cruise ship.

The 23,000-square-foot Mandara Spa on the soon-to-debut, 4,000-passenger Norwegian Breakaway also will have a large thermal suite with 13 heated loungers, vitality pool, whirlpools, sauna, solarium and steam room, along with a full-service salon and barber shop, the line announced today.