Minuma Tennen Onsen Koharubiyori
Saitama, Saitama, Japan
- Location
- Saitama, Saitama, 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
Koharubiyori, also in Saitama City, uses natural sodium-chloride water at 41°C. Indoor bath, outdoor rotenburo and sauna round out this urban bathhouse.
Insider tip — Koharubiyori, the Indian-summer fine-weather spring, serves the Minuma district of Saitama City where the historic Minuma flood-water diversion channels — engineered in 1629 — created the wetland agricultural landscape that now survives as the Minuma tambo ecosystem reserve within the urban fabric of one of Japan largest cities. The Minuma tambo is one of the few surviving traditional wetland rice-paddy habitats within the Tokyo metropolitan area, supporting bittern, little egret, and rare aquatic insects in the shallow channels maintained by environmental volunteers as a living museum of pre-industrial Kanto agriculture.
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 sodium chloride water.
What is the best season to visit?
The most favourable period for this spot is: Toute l'année.