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PR · Agoda

Gunma Minakami, Tone District

群馬県 みなかみ町

from ¥18,700 (≈ $125) / nightper person, tax incl. · Rakuten Travel · as of Nov 2, 2026

Set among the mountains of Minakami, Gunma, Hoshi Onsen Chojukan is a nationally registered tangible cultural property, reached by changing buses from Jomo-Kogen Station on the Joetsu Shinkansen. The bath is 100% kakenagashi, with water welling up between laid river stones. A calcium-sodium sulfate spring is known for a moist, silky feel, and a pH of 8.5 lends the smoothness of alkaline water. Ideal for travelers who want to choose an inn by its water and give a soak plenty of unhurried time.

This spring’s analysis values in one image—save it and post it to your feed or story.

Hoshi Onsen Chojukan (Minakami, Tone District) Sulphate Spring / pH 8.5 / 41.5℃ #onsen #minakami #sulphatespring https://onsen-analysis.com/en/onsen/hoshi-onsen?utm_source=card&utm_medium=social&utm_campaign=onsen_card

Onsen towns are often rural with patchy Wi-Fi and limited public transport. Sort out data, tours and a car before you go.

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