Unzen-onsen is a hot spring town located in the treasure of nature, Japan’s oldest national park. The hot spring has a long history.
Unzen Jigoku high-temperature hot springs and gasses erupt violently from everywhere, and with the strong smell of sulfur, the steamy scenery evokes a vision of hell. There are around 30 geothermal fields, such as “Oito Jigoku”, and “Daikyoukan Jigoku”.
In Buddhist teachings, Jigoku (hell) is where people are punished for their evil deeds that they committed in the past life.
The spring quality of Unzen’s hot springs is acidic sulfur springs, with strong acidity. The hot springs can become as hot as 98℃, and the main components are iron ion, aluminum ion, and sulfate ion, and is effective against rheumatism, diabetes, and dermatosis. Furthermore, the gasses that erupt along with violent sounds can go up to temperatures of 120℃. Mostly composed of steam, it is also composed of carbonated gas and hydrogen sulfide gas, and gives off a strong sulfuric smell.
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