Wakaho Ikoi no Ie; Hoshina Onsen
Nakano, Nagano, Japan
Illustration photo — not a verified picture of this exact spot.
- Location
- Nakano, Nagano, Japan
- Water type
- bicarbonate
- Temperature
- 40 °C
- pH
- 8
Water profile
Thermicity
Sedative
LowHigh
Relaxing — deep, immediate muscle release.
Mineralisation
Restorative
LowHigh
Loaded with major ions — the essential minerals (Ca, Mg).
Buoyancy
Standard buoyancy
LowHigh
Soft water — natural, classic buoyancy.
BicarbonatesSodiumCalcium
Wakaho Ikoi no Ie, home to Hoshina Onsen, is located in Nakano (Nagano). The bicarbonate water reaches 40°C, with a pH of 8, across an indoor bath, an open-air outdoor bath and a sauna.
Insider tip — Wakaho Ikoi no Ie Hoshina Onsen is a community rest house with natural bicarbonate spring water in the Nakano area of northern Nagano, a region dotted with small onsen towns along the Chikuma River. The soft alkaline waters have a pleasant skin-smoothing quality typical of Nagano's bicarbonate springs. The name Ikoi no Ie, meaning House of Repose, captures the unhurried spirit of this local retreat. The surrounding agricultural plains offer crisp mountain air that makes the post-bath rest especially restorative.
Nearby
Frequently asked questions
How hot is the water?
The water runs quite hot here, around 40 °C — a sedative water that brings immediate muscle release.
What type of water is found here?
This spot features bicarbonate water.
What is the best season to visit?
The most favourable period for this spot is: Toute l'année (idéal automne-hiver).