Musashi Koyama Onsen; Shimizuyu
Shinagawa, Tokyo, Japan
- Location
- Shinagawa, Tokyo, Japan
- Water type
- sodium chloride, thermal
- Temperature
- 37 °C
- pH
- 7.3
Water profile
Thermicity
Neutral
LowHigh
Soothing — neither hot nor cold, perfect balance.
Mineralisation
Restorative
LowHigh
Loaded with major ions — the essential minerals (Ca, Mg).
Buoyancy
Effortless float
LowHigh
Dense, salty water — you float without effort.
SodiumChloruresBrome
Musashi Koyama Onsen, known locally as Shimizuyu, is located in Shinagawa, Tokyo. Its sodium-chloride thermal water, at 37°C (pH 7.3), feeds an indoor bath, a rotenburo and a sauna, a favorite among neighborhood residents.
Insider tip — One of Tokyo's most beloved sento, Shimizuyu taps a rare natural hot spring beneath urban Shinagawa. The dark amber sodium-chloride waters warm the body for hours. Arrive early on weekdays to beat the neighbourhood crowd.
Nearby
Frequently asked questions
How hot is the water?
The water is neutral here, around 37 °C — a perfect balance, neither too hot nor too cold.
What type of water is found here?
This spot features sodium chloride & thermal water.
What is the best season to visit?
The most favourable period for this spot is: Toute l'année.