Kinoe Onsen

Analysis Unverified
木江温泉
Salt Spring Above the Islands

Rising at Kinoe on Osakikamijima, an island reached only by ferry, this spring once served a public lodge loved by islanders and sea travelers. Saltier than seawater and rich in calcium with a trace of radon, it is a powerful water for those who want to warm themselves slowly while gazing over the scattered islands.

AI Generated
This source matches 2 spring types· Tap to switch
放
SPRING TYPE
Radium SpringRARE

Limited exposure to radioactivity can be beneficial to the body. Since ancient times, people in Japan have used radioactive springs for therapeutic effects. Taken into the body through the respiratory system, the spring's radioactive components are considered effective as pain relief for conditions such as gout and rheumatoid arthritis.

See features & indications▾
Bathing indications
Hyperuricemia (gout)Rheumatoid arthritisAnkylosing spondylitis
Definition :Contains radon at 30×10⁻¹⁰ Ci/kg (8.25 Mache units) or more.
Source: 環境省「あんしん・あんぜんな温泉利用のいろは」(監修:日本温泉気候物理医学会) ↗Read full article
TEMPERATURE
22.5℃
Cold Mineral Spring
Too cold to bathe directly; requires heating.
KEY MINERALS

The bar length shows how abundant each component is compared to thresholds that make it "distinctive" (therapeutic spring standards, beauty spring criteria, etc.).

Chloride ionSee detail
15200 mg/kg

Salinity comparable to seawater. The salt film traps heat for outstanding warmth ("hot bath spring").

Calcium ionSee detail
4440 mg/kg

Astringent action that tightens the skin and soothes flushing after bathing.

Bromide ionSee detail
29.0 mg/kg

Gentle calming action; often found alongside chloride.

31.1 mE/kg

A rare radioactive spring where trace radiation absorbed via inhalation and skin is expected to stimulate cells (the "hormesis effect").

Magnesium ionSee detail
520 mg/kg

Easily absorbed through the skin, helping to relax muscle stiffness during bathing — a transdermal nutrient unique to hot springs.

CHARACTER · COMPOSITION PROFILE
1234StimulationBactericidalSkin BeautyHeat RetentionRelaxation

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.

USAGE
Usage status is unknown — Information from facility postings or official sites has not been confirmed. Please check with staff on site.
▸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.

EFFECTS
Spring-specific indications (bathing)
Hyperuricemia (gout)Rheumatoid arthritisAnkylosing spondylitisCuts and grazesPeripheral circulatory failurePoor circulationDepressionXeroderma
General indications (bathing)
High blood pressure (mild)Autonomic instabilityInsomniaChronic pain or stiffness in muscles and jointsMuscle stiffness due to motor paralysisGastrointestinal dysfunction
Contraindications
Acute illness (especially with fever)Active tuberculosisMalignant tumorsSevere heart diseaseRespiratory failureRenal failureBleeding disordersSevere anemiaAny actively progressing illnessPregnancy (especially early and late stages)Undergoing radiation therapy, pregnancy (radioactive springs)
BATHING TIPS
AI Generated

At 25.68 g/kg this chloride water is very strong, so take short, repeated soaks in the heated bath and rinse lightly before leaving to reduce stickiness.

EFFECT STORY
AI Generated

With 15,200 mg/kg of chloride, the salt film helps hold in heat for restorative warmth, while 4,440 mg/kg of calcium and a trace of radon make it a spring associated with pain relief.

CAUTIONS
AI Generated

This very strong hypertonic water is heated, recirculated, filtered and disinfected. Avoid long soaks, and those with general contraindications should refrain.

※ See the analysis data below for detailed contraindications

ANALYSIS DATAView all analysis fields ▼

Source Info

Source name
Kinoe Onsen
Spring type
含弱放射能 Sodium-Calcium Chloride Cold Mineral Spring
Old spring type name
含放射能食塩泉
Source temperature
22.5℃
Osmotic pressure
高張性

Analysis Document

Analysis date
1994-03-25
Analyst organization
広島県保健環境センター

Cations

Lithium ion Li⁺
1.2 mg/kg
Sodium ion Na⁺
4100 mg/kg
Potassium ion K⁺
20.0 mg/kg
Magnesium ion Mg²⁺
520 mg/kg
Calcium ion Ca²⁺
4440 mg/kg
Manganese ion Mn²⁺
2.9 mg/kg
Iron(II) ion Fe²⁺
2.7 mg/kg
Lead ion Pb²⁺
not detected
Strontium ion Sr²⁺
36.1 mg/kg
Copper ion Cu²⁺
not detected
Total cations
9.1 mg/kg

Anions

Fluoride ion F⁻
1.5 mg/kg
Chloride ion Cl⁻
15200 mg/kg
Sulfate ion SO₄²⁻
1200 mg/kg
Bicarbonate ion HCO₃⁻
24.4 mg/kg
Bromide ion Br⁻
29.0 mg/kg
Total anions
16.4 mg/kg

Undissociated Components

Metasilicic acid H₂SiO₃
90.0 mg/kg
Total undissociated
0.09 mg/kg

Dissolved Gas

Free carbon dioxide CO₂
15.4 mg/kg
Total dissolved gas
0.02 mg/kg

Trace Components

Radon Rn
31.1 mE/kg

Totals

Component total
25.7 mg/kg

Usage

Usage status
Unknown

Indications & Contraindications

Bathing indications
Hyperuricemia (gout), Rheumatoid arthritis, Ankylosing spondylitis, Cuts and grazes, Peripheral circulatory failure, Poor circulation, Depression, Xeroderma
General indications
High blood pressure (mild), 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), Undergoing radiation therapy, pregnancy (radioactive springs)

Drinking

Drinkability
Not drinkable
FACILITY INFO
AI draft (unverified)
Official site
Tattoo
Cover allowedSmall tattoos are permitted if covered with a sticker (please bring your own).
Private bath (Kashikiri)
Available
Room with private open-air bath
Available
About tattoos and onsen
Travelers with tattoos can still bathe comfortably in a private bath (Kashikiri) or a room with a private open-air bath.
Hours
Weekdays: 10:30〜21:00
Weekends & holidays: 10:30〜14:30
Day-use bathing reception hours. On weekends and holidays, guests are requested to leave the hot spring around 3:00 PM.
Transit
By plane: From Hiroshima Airport (広島空港), take a bus or taxi to Takehara Port (竹原港), then a ferry to Osakikamijima (大崎上島). By train: From Shinkansen Mihara Station (新幹線三原駅), transfer to the JR Kure Line (JR呉線) and get off at Takehara Station (竹原駅). From Takehara Station, take a bus or taxi for 10 minutes to Takehara Port, then a ferry to Osakikamijima. Free shuttle service available to various ports on the island (reservation required, specific times apply).
Parking
50 free parking spaces, no reservation required. 4 EV chargers (200V Enechange) available. Cars can be brought to the island via ferry.
Day use fee
¥800For private baths, a day-use hot spring fee of 2,750 yen is required, in addition to the bathing fee per person (adults 800 yen). On days ending with '5', the fee is 500 yen. As a special offer for using Kazemachi Restaurant, the day-use bathing fee is always 500 yen.
Facilities
SaunaRest AreaShopBarFree Wi-FiRestaurantKaraoke RoomTennis Court
Sources
This information may change without notice. Please contact the facility directly for accurate details.
How Long to Stay (Toji)
Start with 2 nights / 3 days

Japan’s Ministry of the Environment notes that even a short stay refreshes you. For a full therapeutic cure, around 2–3 weeks is the guideline.

More on toji length
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Seifukan

From¥13,200/ person / night (tax incl.)
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Approx. lowest rate (varies by date & guests)

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✨ The descriptions, catch phrases, and translations on this page are generated by AI (Claude). pH, temperature, and component values are OCR-extracted from the official analysis report. Learn more