If you're hoping your upcoming sailing has one, check here first. These lines and ship classes were checked directly and confirmed to not include a dedicated salt room as of this writing — salt-based treatments in a regular spa menu don't count.
No dedicated salt room found across any ship in the fleet; salt appears only as a treatment ingredient, not a room.
Greenhouse Spa across all classes has no salt room.
No salt room found on any ship.
The Enclave/Hammam has a marble slab for salt or mud treatments, but that's a treatment surface, not a dedicated room.
LivNordic Spa includes a snow grotto and hydrotherapy pool, but no salt room in any source, including Viking's own site.
No salt room found in the Otium Spa.
Millennium, Infinity, Summit, Constellation, Solstice, Eclipse, Equinox, Silhouette, and Reflection use the Persian Garden, which has no salt room.
These are open questions we're actively resolving rather than settled negatives — check back, or read the full methodology on the About page.
Not on MSC's official Aurea Spa list and no dedicated ship-page confirmation, despite sister ships Fantasia and Splendida both being confirmed. Checking directly before publishing a full page.
Same situation as Divina — absent from confirmation sources despite being the same class as confirmed ships.