Tamagawa Onsen; Ikoi no Yu
Shunan, Yamaguchi, Japan
- Location
- Shunan, Yamaguchi, Japan
- Water type
- acidic
- Temperature
- 42 °C
- pH
- 3.5
Water profile
Thermicity
Sedative
LowHigh
Relaxing — deep, immediate muscle release.
Mineralisation
Balancing
LowHigh
Rich in trace elements — gentle on the skin.
Buoyancy
Standard buoyancy
LowHigh
Soft water — natural, classic buoyancy.
SoufreAluminiumFer
Tamagawa Onsen, known as Ikoi no Yu, is a hot-spring bath in Shunan, Yamaguchi Prefecture. Its acidic water, with a pH of 3.5, emerges at 42°C, feeding an indoor bath, an outdoor rotenburo and a sauna.
Insider tip — Tamagawa Onsen Ikoi no Yu in Yamaguchi Prefecture draws acidic thermal water characteristic of the geologically active western Chugoku region. Acid springs are relatively rare and are known in Japanese balneology for their antiseptic properties and dramatic effect on skin conditions. The pH-low water creates a sharp, tingly sensation on the skin and should be followed by a freshwater rinse. Bathers with sensitive skin should start with shorter soaks and increase duration gradually.
Nearby
Frequently asked questions
How hot is the water?
The water runs quite hot here, around 42 °C — a sedative water that brings immediate muscle release.
What type of water is found here?
This spot features acidic water.
What is the best season to visit?
The most favourable period for this spot is: Toute l'année (idéal automne-hiver).