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Honjo Onsen Saitama

Honjo, Saitama Prefecture, Japan
Honjo Onsen Saitama
Location
Honjo, Saitama Prefecture, 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

Honjo, in northern Saitama Prefecture on the Tone River, is a historic castle town whose Honjo Castle was a strategic stronghold during the Sengoku warring states period, and the city retains a quiet merchant town character along its old Post Road that once connected the castle domain to Edo's commercial network of highways and river transport. Honjo Onsen Saitama draws on sodium and bicarbonate thermal waters from the deep geological formations of the north Kanto plain, offering relaxing baths in a pleasantly traditional city that preserves the character of pre-modern Musashino highway culture in the broad flatlands of the Tone River basin. The nearby Shibusawa Eiichi birthplace village at Chiaraijima, the historic Josenji Temple garden, and the Tone River waterfront cycling routes create a rewarding heritage travel context for thermal bathing in this quietly distinguished northern Saitama community.

Insider tip — Honjo, situated on the Kanto Plain where the Kanna and Koga rivers converge, draws clean bicarbonate water at 40°C from the sedimentary basin below its flat farmland surroundings. The town retains a provincial, unhurried character that makes its sento a genuinely local experience rather than a tourist facility. Honjo is the birthplace of Nippon Steel's heritage iron industry, and working-class bathing culture remains deeply embedded in the community. The Joshin Dentetsu railway line connects Honjo to Takasaki, passing through a landscape of paddy fields and distant volcanic peaks.
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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).