Tokyo Somei Onsen Sakura
Toshima, Tokyo, Japan
Illustration photo — not a verified picture of this exact spot.
- Location
- Toshima, Tokyo, Japan
- Water type
- iron-rich
- Temperature
- 41 °C
- pH
- 6.3
Water profile
Thermicity
Sedative
LowHigh
Relaxing — deep, immediate muscle release.
Mineralisation
Bio-active
LowHigh
Rich in active gases or metals — a strong mineral character.
Buoyancy
Standard buoyancy
LowHigh
Soft water — natural, classic buoyancy.
FerBicarbonatesManganèse
Tokyo Somei Onsen Sakura, in Toshima Ward, Tokyo, draws iron-rich water at 41°C. The bathhouse, near the Somei district, includes an indoor bath, an outdoor bath (rotenburo) and a sauna.
Insider tip — Tokyo Somei Onsen Sakura taps the famous Somei black water (kuro-yu) of the Toshima district, an iron-rich dark sodium-chloride onsen emerging from 1,500 metres beneath one of Tokyo's most storied neighbourhoods. The Somei area is historically associated with the origins of the beloved Somei-Yoshino cherry blossom. Soaking in the dark, velvety water under cherry trees during hanami season is an unforgettable Tokyo experience. The intimate neighbourhood scale distinguishes it sharply from the city's larger commercial onsen complexes.
Nearby
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 iron-rich water.
What is the best season to visit?
The most favourable period for this spot is: Toute l'année (idéal automne-hiver).