Oku no Yu
Analysis VerifiedOpened in 2006, Bouro NOGUCHI Noboribetsu introduced a refined 'modern Japanese' aesthetic to Noboribetsu Onsen's storied landscape. Every suite features a private observation bath, creating an intimate sanctuary for discerning travelers seeking solitude and sophistication. Immerse yourself in one of Japan's celebrated waters while stepping away from the clamor of daily life—a retreat designed for those who cherish understated elegance.
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.
The source of the distinctive sulfur smell. Dilates blood vessels via skin and inhalation to strongly boost circulation.
A natural moisturizer also used in skincare lotions. Forms a thin veil on the skin to reduce moisture loss after bathing.
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.
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.
This spring gushes at the elevated temperature of 46.1°C. Before entering, always rinse your hands and feet gradually with the hot water to acclimate your body to its heat. Guests with compromised cardiovascular function are advised to favor half-body immersion over full submersion.
Rich in metasilicic acid (130.3 mg/kg) and gently acidic, this sulfur spring soothes sensitive skin while addressing poor peripheral circulation and chronic cold sensitivity. The warmth penetrates deep after bathing, lingering through your body for hours. Steep yourself fully to dissolve daily stress and fatigue, unlocking profound restoration.
Those with sensitive skin or mucous membranes, and elderly guests prone to xerosis, should bathe with caution. This spring is not potable—please refrain from drinking entirely.
※ See the analysis data below for detailed contraindications
ANALYSIS DATAView all analysis fields ▼
Source Info
- Source name
- 奥の湯
- Spring type
- 含硫黄-ナトリウム・カルシウム-塩化物・硫酸塩温泉（硫化水素型）
- Old spring type name
- 含石膏-食塩硫化水素泉
- Source temperature
- 46.1℃
- pH
- 5.7
- Flow rate
- 50 L/min
- Osmotic pressure
- 低張性
Analysis Document
- Analysis date
- 2014-10-29
- Analyst organization
- 株式会社第一岸本臨床検査センター
- Registration No.
- 北海道第12号
Cations
- Sodium ion Na⁺
- 245 mg/kg
- Potassium ion K⁺
- 74.3 mg/kg
- Ammonium ion NH₄⁺
- 1.6 mg/kg
- Magnesium ion Mg²⁺
- 19.5 mg/kg
- Calcium ion Ca²⁺
- 84.2 mg/kg
- Aluminum ion Al³⁺
- 0.20 mg/kg
- Manganese ion Mn²⁺
- 1.2 mg/kg
- Iron(II) ion Fe²⁺
- 0.40 mg/kg
- Lead ion Pb²⁺
- 0.00 mg/kg
- Cadmium ion Cd²⁺
- 0.00 mg/kg
- Total cations
- 0.43 mg/kg
Anions
- Fluoride ion F⁻
- 0.30 mg/kg
- Chloride ion Cl⁻
- 513 mg/kg
- Hydrogen sulfide ion HS⁻
- 0.60 mg/kg
- Thiosulfate ion S₂O₃²⁻
- 0.00 mg/kg
- Sulfate ion SO₄²⁻
- 195 mg/kg
- Bicarbonate ion HCO₃⁻
- 12.2 mg/kg
- Carbonate ion CO₃²⁻
- 0.00 mg/kg
- Hydrogen sulfate HSO₄⁻
- 0.00 mg/kg
- Dihydrogen phosphate H₂PO₄⁻
- 0.90 mg/kg
- Total anions
- 0.72 mg/kg
Undissociated Components
- Arsenious acid HAsO₂
- 1.2 mg/kg
- Metasilicic acid H₂SiO₃
- 130 mg/kg
- Metaboric acid HBO₂
- 64.1 mg/kg
- Total undissociated
- 0.20 mg/kg
Dissolved Gas
- Free carbon dioxide CO₂
- 6.8 mg/kg
- Free hydrogen sulfide H₂S
- 12.8 mg/kg
- Total dissolved gas
- 0.02 mg/kg
Totals
- Total dissolved substances
- 1.3 mg/kg
- Component total
- 1.4 mg/kg
- Evaporation residue
- 1.2 mg/kg
Usage
- Heating
- No
- Dilution
- Yes（入浴に適した温度にするため）
- Recycle / Filter
- No
- Additives
- No
- Disinfection
- No
Indications & Contraindications
- Bathing indications
- Cuts and grazes, Peripheral circulatory failure, Poor circulation, Depression, Xeroderma, Atopic dermatitis, Psoriasis vulgaris, Chronic eczema, Epidermal purulent disease
- General indications
- Chronic pain or stiffness in muscles and joints (rheumatoid arthritis, osteoarthritis, low back pain, neuralgia, frozen shoulder, bruises, sprains, etc. in the chronic stage), Muscle stiffness due to motor paralysis, Gastrointestinal dysfunction (heaviness in the stomach, gas in the intestines, etc.), High blood pressure (mild), Impaired glucose tolerance (diabetes), Dyslipidemia (mild), Mild asthma or emphysema, Autonomic instability, Hemorrhoidal pain, Stress-related symptoms (insomnia, depression, etc.), Convalescence, Fatigue recovery, Health promotion
- Contraindications
- People with sensitive skin or mucous membranes, elderly people with xeroderma, active stage of illness (especially when there is a fever), active tuberculosis, severe physical weakness such as advanced malignant tumors or severe anemia, severe heart or lung diseases that cause shortness of breath with a little movement, severe kidney disease with edema, gastrointestinal bleeding, visible bleeding, acute exacerbation of chronic diseases
Drinking
- Drinkability
- Not drinkable
- Drinking notes
- Do not drink.
