Atagoyama Sengen
Analysis VerifiedThe Atagoyama Sengen, gushing forth in Arima Onsen—one of Japan's three ancient hot springs—is a prime example of the "Kinsen" (gold spring), which turns a vivid reddish-brown upon contact with air. Its history is deep, having long supported the therapeutic bathing culture of Arima. The water from this source, rich in salt and iron, offers a powerful warmth that heats the body to its core. Steeping in this bath envelops you in a warmth that feels infused with the earth's blessings, a sensation that lingers long after you emerge.
The bar length shows how abundant each component is compared to thresholds that make it "distinctive" (therapeutic spring standards, beauty spring criteria, etc.).
Undissociated boric acid with antibacterial action that keeps the skin surface clean.
Salinity comparable to seawater. The salt film traps heat for outstanding warmth ("hot bath spring").
Salt forms a thin film on the skin, retaining heat after bathing. Helps with poor circulation.
Absorbed through the skin to gently calm nervous tension, leaving deep relaxation after the bath.
A rare radioactive spring where trace radiation absorbed via inhalation and skin is expected to stimulate cells (the "hormesis effect").
- Iron48.5 mg/kg
- Feel
- Turns reddish-brown in the air, with a rusty-iron smell.
- Said to
- Said to warm the body; where drinking is permitted, said to help iron-deficiency anemia.
- Note
- May stain white towels and swimwear.
- Chloride (salt)30600 mg/kg
- Feel
- Tastes salty; the warmth lasts after you get out.
- Said to
- Salt is said to form a film on the skin that keeps in heat and moisture. Bathing indications include cuts, poor circulation and dry skin.
- Note
- May sting cuts. Strong salty water can tire you—avoid long soaks.
- Metasilicic acid297 mg/kg
- Feel
- Your skin may feel smoother.
- Said to
- 50 mg/kg or more is said to mark a “skin-beautifying spring”; it is also used in skincare.
- Note
- The “skin-beautifying” label is a common rule of thumb, not a legal standard.
- Source temperature96.6℃
- Feel
- The source is 42°C or hotter; the bath may be on the hot side.
- Said to
- Heat is said to boost circulation and warm the body.
- Note
- Older people and those with high blood pressure or heart conditions should avoid baths of 42°C or more. Keep soaks short.
Effects are general descriptions based on the Ministry of the Environment’s indications by spring type, not a guarantee.
Scores are calculated from mineral analysis data based on the Mineral Spring Analysis Guidelines (Ministry of Environment, Japan). They are unrelated to facility atmosphere or service quality.
▸Note
The temperature, pH and component values shown here are based on the hot spring analysis (source). Actual values in the bath may differ depending on heating, dilution, recycling and filtration. Please check current usage status at the facility.
As the source is extremely hot at 96.6°C, it is cooled to a suitable temperature at the facility. Due to the very high salt concentration, it's recommended to rinse off lightly with fresh water after bathing, especially for those with sensitive skin. Avoid long soaks and remember to stay hydrated.
As one of Japan's leading chloride springs with 30,600 mg/kg of chloride ions, it creates a salt veil on the skin, offering excellent restorative warmth that prevents post-bath chills. This effect is traditionally associated with relieving poor circulation. Furthermore, the abundant iron content may support rejuvenation as part of a balneotherapy regimen.
Due to its very high salt concentration, individuals with sensitive skin or open cuts may feel a stinging sensation. As a high-temperature, hypertonic spring, it is wise to start with shorter bathing times.
※ See the analysis data below for detailed contraindications
ANALYSIS DATAView all analysis fields ▼
Source Info
- Source name
- Atagoyama Sengen
- Spring type
- Iron-containing Sodium Chloride and 強塩高 Hot Spring
- Source temperature
- 96.6℃
- pH
- 6.14
- Flow rate
- 58 L/min
- Flow type
- 掘削自噴
- Osmotic pressure
- 高張性
Analysis Document
- Analysis date
- 2017-03-23
- Analyst organization
- 兵庫県立健康生活科学研究所
- Registration No.
- 薬第02E-0001号
Cations
- Lithium ion Li⁺
- 46.5 mg/kg
- Sodium ion Na⁺
- 13800 mg/kg
- Potassium ion K⁺
- 3220 mg/kg
- Magnesium ion Mg²⁺
- 23.6 mg/kg
- Calcium ion Ca²⁺
- 2900 mg/kg
- Aluminum ion Al³⁺
- 0.00 mg/kg
- Manganese ion Mn²⁺
- 32.2 mg/kg
- Iron(II) ion Fe²⁺
- 48.5 mg/kg
- Zinc ion Zn²⁺
- 1.6 mg/kg
- Strontium ion Sr²⁺
- 50.4 mg/kg
- Barium ion Ba²⁺
- 40.2 mg/kg
- Total cations
- 20200 mg/kg
Anions
- Fluoride ion F⁻
- 2.8 mg/kg
- Chloride ion Cl⁻
- 30600 mg/kg
- Sulfate ion SO₄²⁻
- 0.20 mg/kg
- Bicarbonate ion HCO₃⁻
- 465 mg/kg
- Bromide ion Br⁻
- 57.4 mg/kg
- Iodide ion I⁻
- 0.40 mg/kg
- Total anions
- 31126 mg/kg
Undissociated Components
- Metasilicic acid H₂SiO₃
- 297 mg/kg
- Metaboric acid HBO₂
- 388 mg/kg
- Total undissociated
- 685 mg/kg
Dissolved Gas
- Free carbon dioxide CO₂
- 565 mg/kg
- Total dissolved gas
- 565 mg/kg
Trace Components
- Radon Rn
- 44.1 Bq/kg
Totals
- Total dissolved substances
- 52600 mg/kg
- Component total
- 53200 mg/kg
- Evaporation residue
- 51000 mg/kg
Usage
- Heating
- No
- Dilution
- Yes（To lower the temperature of the hot spring water.）
- Recycle / Filter
- No
- Additives
- No
- Disinfection
- No
Indications & Contraindications
- Bathing indications
- Cuts and grazes, Peripheral circulatory failure, Poor circulation, Depression, Xeroderma
- General indications
- High blood pressure (mild), Rheumatoid arthritis, Autonomic instability, Insomnia, Chronic pain or stiffness in muscles and joints, Muscle stiffness due to motor paralysis, Gastrointestinal dysfunction
- Contraindications
- Acute illness (especially with fever), Active tuberculosis, Malignant tumors, Severe heart disease, Respiratory failure, Renal failure, Bleeding disorders, Severe anemia, Any actively progressing illness, Pregnancy (especially early and late stages)
Drinking
- Drinkability
- Not drinkable
