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Shimotsuma Onsen Ibaraki

Shimotsuma, Ibaraki, Japan
Shimotsuma Onsen Ibaraki
Location
Shimotsuma, Ibaraki, 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

Shimotsuma, in the central Ibaraki Prefecture plain between Mito and Tsukuba, is an agricultural city set in the fertile Ibaraki lowlands known for its traditional Kanto natto soybean cultivation and the Shimotsuma area's contribution to the regional dried sweet potato (hoshi-imo) production that has made Ibaraki Prefecture the source of over 90% of Japan's dried sweet potato supply. Shimotsuma Onsen Ibaraki draws on sodium and bicarbonate thermal waters from the geological resources of the central Ibaraki plain, providing restorative baths in an agricultural community whose natto and hoshi-imo heritage, the flat Kanto plain landscape, and easy access to both Mito and Tsukuba on the Kanto-Shinkansen corridor create a practical and unpretentious spa destination. The Ibaraki Prefecture hoshi-imo dried sweet potato farms and processing tradition, the Shimotsuma agricultural cooperative markets, and the cycling paths through the flat rice paddy and field landscape of central Ibaraki create a pleasantly agricultural backdrop for thermal relaxation in this productive Ibaraki farming community.

Insider tip — Shimotsuma sits on the wide Kanto plain where artesian wells tap bicarbonate-rich warm water from deep Pleistocene sediments. The spring here is particularly soft, making it ideal for skin care and general relaxation. A visit pairs well with a stop at the Ibaraki Flower Park or the vast lotus ponds that bloom spectacularly in mid-summer across the neighboring wetlands.
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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).