航空チケット+ホテル スキーツアー 高速バス・深夜バス
航空チケット+ホテル スキーツアー 高速バス・深夜バス
Japan travel guide

Types of Onsen

There are many different kinds of hot springs: Simple Springs, Carbonate Springs, Salt Springs, Sodium Sulfate Springs, Iron Springs, Acidic Springs, Sulfur Springs and Radium Hot springs.


Simple Springs - The most common type. Its temperature is higher than 25°C , and has less than 1 gram of compounds or mineral elements per kilogram of water. Its mildness makes it perfect for long term rehabilitations.


Carbonate Springs - Similar to the simple spring, but carbonated. It has less than 1 gram of radical carbon and other mineral elements per kilogram, and are often low in temperature. Carbonate springs are considered effective for circulatory and neurological disorders, and women's health.


Salt Springs - Second in abundance to simple springs, salt springs have more than 1 gram per kilogram of compound or mineral elements. If the water contains between 1 and 5 grams of salt, it is considered a weak salt spring. 5 to 10 grams makes it a regular salt spring, and those with over 10 grams are strong salt springs. The high salt content helps the body to maintain warmth long after bathing, so it is often called 'Atsu no yu'(Warmth water)


Sodium Sulfate Springs - Basic, bitter springs with a high sodium sulfate content, recommended for arteriosclerosis and rheumatism.


Iron Springs - There are two different kinds of iron springs, carbonate and green vitriol. When the water is boiled, the iron oxidizes and turns a reddish brown. The vitriol springs contains iron sulfate and is strongly acidic.


Acidic Springs - Indigenous to Japan, and found mainly in volcanically active areas. These springs have a high hydrogen ion content, making them strongly acidic and often irritating. They have been used to treat infections of the skin such as athlete's foot.


Sulfur Springs - Contains sulfhydryl ions or hydrogen sulfide, and smells like rotten eggs. May be bathed in or drunk, for treating many disorders.


Radium Hot springs - These contain a certain amount of radium, radon or thoron, which are moderately radioactive and thought to be good for digestive disorders or rheumatism.



Noboribetsu onsen
Hakone onsen
Yuzawa onsen
Ikaho onsen
Izu onsen
Atami onsen
Ito onsen
Dogo onsen
Kusatsu onsen
Kinugawa onsen
Yufuin onsen
Beppu onsen
Ibusuki onsen
Nanki Shirahama onsen
Gero onsen
Nagahama onsen





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