“Yugama”is crater lake, which is located on the top of “Mount Kusatsu Shirane” in Gunma prefecture.
The characteristic of “Yugama” is high acidity: pH of 1.0. Hydrogen chloride and sulfur dioxide melt into the water of this Japanese nature spot. The color of lake is cloudy emerald green under the influence of iron ion and sulfur in the water. Unfortunately, “Yugama” is no-go zone now because of risk of volcano activity.
“Kusatsu” is one of the most famous hot springs spot in Japan. When you come to “Kusatsu”, why don’t you go to “Yugama” if safety is guaranteed?
by TANAKA Juuyoh (田中十洋)
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