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Sodium chloride hot springs

3511 sodium chloride-water places mapped worldwide. Find where to soak — and where to stay nearby.

Hotels in Japan →See the springs ↓

What is sodium chloride water?

Sodium Chloride (NaCl) creates a hypertonic, high-density solution. This density increases buoyancy, reducing the body's apparent weight: you float more easily.

Salt crystallizes on the skin after the bath, blocking sweat evaporation and retaining heat ("Heat Retaining").

pH
Neutral (7.0)
Family
Cation (+)
Element
Na · Na⁺ Cl⁻
Origin
Triassic (evaporated fossil seas)
Best for
Invigorating buoyancy & lasting warmth
Temperature
Cold (warmed for treatment)

What it feels like

The high density of salt water enhances buoyancy and allows weightless body mobilization. Long-lasting warming effect ("Heat retaining").

Sensations & traditions

Did you know — Some springs such as Salies-de-Béarn are ten times saltier than seawater.
Good to know — Edema, Renal insufficiency, Unstabilized hypertension.

Wellness and cultural information — no therapeutic claims. If in doubt, ask a healthcare professional.

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3511 sodium chloride springs to explore

Frequently asked questions

What is sodium chloride water?
Sodium Chloride (NaCl) creates a hypertonic, high-density solution. This density increases buoyancy, reducing the body's apparent weight: you float more easily. Salt crystallizes on the skin after the bath, blocking sweat evaporation and retaining heat ("Heat Retaining").
What does a sodium chloride-water bath feel like?
Strong buoyancy (lighter body). Invigorating sensation. Heat retained after the bath. Highly mineralized waters of marine tradition.
Where can I find sodium chloride hot springs?
Thermae lists 3511 sodium chloride-water places worldwide, including Salies-de-Béarn (France), Atami Onsen (Japan), Katayamazu Onsen (Japan). Explore the map to filter them by country and destination.
Are there any precautions with sodium chloride water?
Edema, Renal insufficiency, Unstabilized hypertension. Wellness and cultural information — no therapeutic claims. If in doubt, ask a healthcare professional.

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