Naguri Onsen; Sawarabi no Yu
Naguri, Hannō, Saitama, Japan
- Location
- Naguri, Hannō, Saitama, Japan
- Water type
- sodium chloride, thermal
- Temperature
- 40 °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
Naguri Onsen Sawarabi no Yu, in Naguri near Hannō, Saitama Prefecture, taps sodium-chloride thermal water at 40°C, with an indoor bath, an outdoor rotenburo and a sauna.
Insider tip — Naguri Valley (名栗) in the Okumusashino highlands is one of Tokyo's premier day-trip escapes: kayaking the clear Naguri River, hiking Mt. Buko and surrounding ridges, and camping in ancient cedar forests. Sawarabi no Yu (Young Fern Frond Bath) is named for the unfurling mountain ferns of spring — a delicate, nature-saturated name for an onsen where the sounds of the mountain stream compete with the steam rising from the baths. Pure Saitama wilderness within an hour of Ikebukuro.
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 sodium chloride & thermal water.
What is the best season to visit?
The most favourable period for this spot is: Toute l'année.