Gifu-shi Nagaragawa Onsen
Analysis UnverifiedGifu-shi Nagaragawa Onsen is a city-owned source rising beside the Nagara River, famed for its cormorant fishing, at the foot of Mt. Kinka. Pumped up clear from underground, the water slowly turns yellow-brown as its iron oxidizes in the air, becoming the reddish, cloudy riverside bath the area is known for. A faint iron taste and metallic aroma reveal its rich iron content. It suits travelers who watch the cormorant boats' bonfires on a summer night, stroll the old Kawaramachi streets, then sink into a rustic, robust soak.
The bar length shows how abundant each component is compared to thresholds that make it "distinctive" (therapeutic spring standards, beauty spring criteria, etc.).
A rare radioactive spring where trace radiation absorbed via inhalation and skin is expected to stimulate cells (the "hormesis effect").
An iron-rich spring whose water turns yellow-brown to red-brown when exposed to air. Strong heat retention.
Absorbed through the skin to gently promote peripheral circulation.
- Iron20.2 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.
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.
The source is a 16.9°C cold spring, so it is heated for bathing. Iron in the water can stain white towels brown, so a dark towel is a safe choice; pat dry lightly afterward to keep the warmth.
Holding 20.2 mg/kg of ferrous iron, this iron-bearing spring is traditionally associated with rejuvenation and a deep, warming soak, and may help relieve pain from travel fatigue and chill.
Iron in the water may discolor white towels, swimwear and jewelry. Avoid overheating, and keep baths short if you feel unwell.
※ See the analysis data below for detailed contraindications
ANALYSIS DATAView all analysis fields ▼
Source Info
- Source name
- Gifu-shi Nagaragawa Onsen
- Spring type
- Simple Iron Cold Mineral Spring
- Source temperature
- 16.9℃
- pH
- 6.6
- Flow rate
- 500 L/min
- Flow type
- 動力揚湯
- Osmotic pressure
- 低張性
Analysis Document
- Analysis date
- 2017-12-07
- Analyst organization
- 一般財団法人 岐阜県公衆衛生検査センター
- Registration No.
- 岐阜県第2号
Cations
- Sodium ion Na⁺
- 8.2 mg/kg
- Potassium ion K⁺
- 1.4 mg/kg
- Magnesium ion Mg²⁺
- 2.6 mg/kg
- Calcium ion Ca²⁺
- 5.2 mg/kg
- Aluminum ion Al³⁺
- 0.04 mg/kg
- Manganese ion Mn²⁺
- 0.80 mg/kg
- Iron(II) ion Fe²⁺
- 20.2 mg/kg
- Total cations
- 38.4 mg/kg
Anions
- Fluoride ion F⁻
- < 0.1 mg/kg
- Chloride ion Cl⁻
- 5.5 mg/kg
- Hydrogen sulfide ion HS⁻
- 0.04 mg/kg
- Sulfate ion SO₄²⁻
- 5.8 mg/kg
- Bicarbonate ion HCO₃⁻
- 81.1 mg/kg
- Nitrate ion NO₃⁻
- < 0.05 mg/kg
- Total anions
- 92.4 mg/kg
Undissociated Components
- Metasilicic acid H₂SiO₃
- 45.0 mg/kg
- Metaboric acid HBO₂
- 0.07 mg/kg
- Total undissociated
- 45.0 mg/kg
Dissolved Gas
- Free carbon dioxide CO₂
- 52.5 mg/kg
- Free hydrogen sulfide H₂S
- 0.10 mg/kg
- Total dissolved gas
- 52.6 mg/kg
Trace Components
- Radon Rn
- 45.9 Bq/kg
Totals
- Total dissolved substances
- 176 mg/kg
- Component total
- 228 mg/kg
- Evaporation residue
- 117 mg/kg
Usage
- Usage status
- Unknown
Indications & Contraindications
- General indications
- High blood pressure (mild), Rheumatoid arthritis, Autonomic instability, Insomnia, Depression, 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