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Shiraoka Onsen Saitama

Shiraoka, Saitama (Kanto), Japan
Shiraoka Onsen Saitama
Location
Shiraoka, Saitama (Kanto), Japan
Water type
bicarbonate
Temperature
40 °C
pH
8

Water profile

Thermicity
Sedative
40 °C
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

Shiraoka, in the southern Saitama Prefecture along the Tone River approaches, is an agricultural community known for its traditional Saitama strawberry cultivation — the early-season Tochiotome and Akihime varieties grown in the warm southern Saitama lowlands reaching market in winter thanks to the heated greenhouse technology that has made Saitama one of Japan's most significant strawberry-producing prefectures. Shiraoka Onsen Saitama draws on sodium and bicarbonate thermal waters from the geological resources of the southern Saitama lowlands, providing restorative baths in a strawberry-cultivating agricultural community whose seasonal berry picking experiences, traditional Kanto plain farmhouse landscape, and convenient access to the Tokyo metropolitan area and the Tobu Isesaki Line create an accessible and pleasantly agricultural spa setting. The Shiraoka strawberry farm picking experiences from December through May, the Saitama Prefecture traditional daikon radish and Chinese vegetable farming of the surrounding plain, and the easy access to the Kasukabe and Koshigaya shopping and cultural centres make Shiraoka a pleasantly seasonal and agricultural spa destination.

Insider tip — Shiraoka sits on the southern edge of the Saitama plain close to the Oyama-Kaido highway, a compact bedroom community with strong ties to traditional crafts and market gardening. Its bicarbonate spring water bubbles up at 40 degrees from Pleistocene sediments and is gently alkaline, conditioning the skin without irritation. The sento is a neighbourhood anchor where locals of all ages share the communal baths with easy familiarity.
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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).