Zao Okama is a crater located at an altitude of 1670 M and is a natural art created by an eruption about 3000 years ago. It is a circular volcanic lake about 330m in diameter, and the scenery of the lake containing emerald green water is just mysterious. Sulfur is still blowing out from the bottom of the lake with a maximum depth of about 27m, and its water quality is strongly acidic. If you walk around 1.2km around the Okama, it takes about 40 minutes.

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Video taken in 2016.９.２６