Salt therapy directories already exist for land-based studios. Nobody had done the same work for cruise ships — a smaller, more knowable list, but one where the existing information online is inconsistent and often just wrong.
Every ship listed here is checked against that cruise line's own current spa page, official press materials, or deck plans, rather than third-party blog posts alone. Where sources disagreed — which happened more than you'd expect — we note it on the relevant page rather than picking silently. Cruise ship spas change with refurbishments and dry docks, so treat every page here as "true as of when we checked," not a permanent guarantee, and confirm with the cruise line directly before booking a spa pass around it.
This project is a companion to AquaticTherapyHub.com, which covers the Blue Mind neuroscience behind why water and restorative environments help lower stress in the first place.