Gora Onsen (No. 5 & 6 Well Mixed Steam-Generated Spring)
Analysis VerifiedGora Onsen is a unique "steam-created spring," established in the early Showa period, born from the reaction between volcanic steam from Owakudani and water from Sengokuhara. This blessing embodies the fusion of Hakone's natural power and human ingenuity. A gentle salt veil envelops the skin, delivering heat deep into the body's core, ensuring restorative warmth that lingers long after your bath. It's the perfect spring to soothe the fatigue of an active day and quietly replenish your vitality for tomorrow.
The bar length shows how abundant each component is compared to thresholds that make it "distinctive" (therapeutic spring standards, beauty spring criteria, etc.).
A trace component with gentle antibacterial and anti-inflammatory action.
A natural moisturizer also used in skincare lotions. Forms a thin veil on the skin to reduce moisture loss after bathing.
The aroma typical of sulfur springs, with circulatory and antibacterial effects.
- Chloride (salt)559 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 acid161 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 temperature56.2℃
- 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.
Given the high temperature, avoid prolonged soaking and exit the bath once you begin to sweat. While this chloride spring helps retain body heat, remember to rehydrate afterward. Those with sensitive skin may wish to rinse off the mineral components after bathing.
Abundant chloride ions (559 mg/kg) form a delicate veil on the skin, providing restorative warmth that prevents post-bath chills. This quality, often called "Atsu-no-yu" (heat-retaining spring), is traditionally associated with relieving muscle and joint pain. With a high metasilicic acid content of 161 mg/kg, it also supports skin metabolism, promoting a silky skin feel, making it ideal for balneotherapy.
Avoid bathing during active phases of illness, if extremely weak, or if you have severe heart or kidney disease. Refrain from high-temperature baths and start with shorter durations, gradually increasing as you acclimate.
※ See the analysis data below for detailed contraindications
ANALYSIS DATAView all analysis fields ▼
Source Info
- Source name
- Gora Onsen (No. 5 & 6 Well Mixed Steam-Generated Spring)
- Spring type
- Sodium Chloride Hot Spring
- Old spring type name
- 弱食塩泉
- Source temperature
- 56.2℃
- pH
- 7.3
- Flow type
- 蒸気造成泉
- Osmotic pressure
- 低張性
Analysis Document
- Analysis date
- 2018-07-11
- Valid until
- 2028-07-10
- Analyst organization
- 神奈川県温泉地学研究所
- Registration No.
- 第1号
Cations
- Lithium ion Li⁺
- 0.00 mg/kg
- Sodium ion Na⁺
- 342 mg/kg
- Potassium ion K⁺
- 46.6 mg/kg
- Magnesium ion Mg²⁺
- 2.1 mg/kg
- Calcium ion Ca²⁺
- 28.5 mg/kg
- Aluminum ion Al³⁺
- 0.07 mg/kg
- Manganese ion Mn²⁺
- 0.01 mg/kg
- Iron(II) ion Fe²⁺
- 0.02 mg/kg
- Zinc ion Zn²⁺
- 0.00 mg/kg
- Lead ion Pb²⁺
- 0.04 mg/kg
- Strontium ion Sr²⁺
- 0.17 mg/kg
- Copper ion Cu²⁺
- 0.00 mg/kg
- Cadmium ion Cd²⁺
- 0.00 mg/kg
- Total cations
- 419 mg/kg
Anions
- Chloride ion Cl⁻
- 559 mg/kg
- Hydrogen sulfide ion HS⁻
- 0.60 mg/kg
- Sulfate ion SO₄²⁻
- 21.2 mg/kg
- Bicarbonate ion HCO₃⁻
- 68.0 mg/kg
- Carbonate ion CO₃²⁻
- 0.10 mg/kg
- Bromide ion Br⁻
- 1.2 mg/kg
- Nitrate ion NO₃⁻
- 0.71 mg/kg
- Hydrogen metasilicate HSiO₃⁻
- 0.64 mg/kg
- Metaborate ion BO₂⁻
- 0.37 mg/kg
- Total anions
- 652 mg/kg
Undissociated Components
- Metasilicic acid H₂SiO₃
- 161 mg/kg
- Metaboric acid HBO₂
- 30.4 mg/kg
- Total undissociated
- 191 mg/kg
Dissolved Gas
- Free carbon dioxide CO₂
- 5.8 mg/kg
- Free hydrogen sulfide H₂S
- 0.34 mg/kg
- Total dissolved gas
- 6.1 mg/kg
Totals
- Total dissolved substances
- 1262 mg/kg
- Component total
- 1268 mg/kg
- Evaporation residue
- 1389 mg/kg
Usage
- Heating
- No
- Dilution
- No
- Recycle / Filter
- No
- Additives
- No
- Disinfection
- Yes（Chlorine-based agents are used for sanitation purposes.）
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
