Kaminoseki Kaikyo Onsen; Hatoko no Yu
Kaminoseki, Yamaguchi, Japan
- Location
- Kaminoseki, Yamaguchi, Japan
- Water type
- sodium chloride
- Temperature
- 41 °C
- pH
- 7.3
Water profile
Thermicity
Sedative
LowHigh
Relaxing — deep, immediate muscle release.
Mineralisation
Restorative
LowHigh
Loaded with major ions — the essential minerals (Ca, Mg).
Buoyancy
Effortless float
LowHigh
Dense, salty water — you float without effort.
SodiumChloruresBrome
Kaminoseki Kaikyo Onsen / Hatoko no Yu, in Kaminoseki, Yamaguchi Prefecture, offers sodium-chloride water at 41°C. An indoor bath, an outdoor rotenburo, and a sauna are available facing the Kaminoseki strait.
Insider tip — Hatoko no Yu, the little dove spring, serves Kaminoseki Town at the tip of a peninsula guarding the narrow Inland Sea passage between Yamaguchi and Iyo Provinces. The proposed Kaminoseki Nuclear Power Plant was contested by local fishermen and environmental groups for decades before plans were suspended, and the town remains a quiet fishing community at a historical maritime chokepoint where feudal daimyo once paid toll to pass their fleets.
Nearby
Yanai Swimming School; Kenko Yoda Onsen
Yanai, Yamaguchi
Toida Onsen
Toida, Hiroshima (Chugoku)
Ryuzaki Onsen Chidori; Shiokaze no Yu
Suo-Oshima, Yamaguchi
Mishima Onsen Kenko Koryu Shisetsu; Yupark Hikari
Hikari, Yamaguchi
Katasoegahama Onsen; Yuyu Land
Suo-Oshima, Yamaguchi
Mitsuoka Onsen
Shunan, Yamaguchi Prefecture
Frequently asked questions
How hot is the water?
The water runs quite hot here, around 41 °C — a sedative water that brings immediate muscle release.
What type of water is found here?
This spot features sodium chloride water.
What is the best season to visit?
The most favourable period for this spot is: Toute l'année.