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Nasu fumaroles

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description Nasu fumaroles Overview

The Nasu fumaroles are active geothermal gas vents situated in the volcanic highlands of Tochigi Prefecture on the island of Honshu, Japan. Located near Mount Chausudake, these sulfurous vents release continuous steam and gases, creating a harsh but visually striking landscape. The geothermal activity associated with the fumaroles supports a prominent local hot spring resort industry that attracts visitors year-round. Additionally, the site was historically utilized for active sulfur mining operations.

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Where are the Nasu fumaroles located?

The fumaroles are on or near the western face of Mount Chausudake in the Nasu volcanic group, in Tochigi Prefecture on Honshu. Chausudake is described by Japan's Geological Survey as the currently active volcano in the group. [Geological Survey of Japan](https://gbank.gsj.jp/volcano/Act_Vol/nasu/text/eng/exp09-1e.html)

What comes out of the Nasu fumaroles?

They release hot steam and sulfurous volcanic gases through vents and cracks in the ground. The gas is responsible for the strong sulfur smell and the sparse, bleached landscape around sites such as Mugen Jigoku. [Japan Tourism Agency](https://www.mlit.go.jp/tagengo-db/en/R2-00672.html)

Can visitors safely walk near the Nasu fumaroles?

Visitors can use designated trails and viewing areas, but they should never enter closed vent or crater zones. Japan's Meteorological Agency warns that fumaroles and volcanic gas inside the crater area can pose a serious danger. [Japan Meteorological Agency](https://www.data.jma.go.jp/vois/data/report/activity_info/301.html)

How are the Nasu fumaroles related to Nasu Onsen?

The volcanic heat feeds the Nasu hot-spring area, which has been known since at least the eighth century. Nearby attractions include the sulfurous Sesshoseki, also called the Killing Stone, where volcanic gas continues to escape. [JNTO](https://www.japan.travel/en/spot/304/)

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