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Kashiwa Onsen Chiba

Kashiwa, Chiba Prefecture, Japan
Kashiwa Onsen Chiba
Location
Kashiwa, Chiba Prefecture, Japan
Water type
sodium chloride
Temperature
41 °C
pH
7.3

Water profile

Thermicity
Sedative
41 °C
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

Kashiwa, in the northwestern Chiba Prefecture along the Tone River, is a major suburban city on the Joban Line between Tokyo and Mito known for its remarkable concentration of scientific research institutions including the University of Tokyo Kashiwa Campus and the National Institute for Environmental Studies, making it alongside Tsukuba a significant node in Japan's greater capital region research network. Kashiwa Onsen Chiba draws on chloride-rich thermal waters from the geological resources of the Chiba plain, providing warm restorative baths in a major suburban research community whose academic culture, excellent Joban Line access to central Tokyo, and the traditional Tone River corridor farming landscape of the Kashiwa hinterland create a practically located urban spa destination. The Kashiwa Tanpopo no Ie Cultural Centre, the traditional Tone River waterway culture of the northern Chiba-Ibaraki border, and the excellent dining options in the vibrant Kashiwa station area create a lively and convenient spa destination in one of northwestern Chiba's most dynamic suburban cities.

Insider tip — Kashiwa is one of the largest suburban cities north of Tokyo, and its urban sento draws saline waters from deep Paleogene formations that once lay beneath an ancient sea. The sodium-chloride content promotes warmth retention long after leaving the bath, making it popular with shoppers from the Mitsui outlet nearby. At 41°C the water delivers a satisfying cardiovascular workout without overwhelming first-time visitors. Choose an early weekday slot to avoid the lively weekend crowds.
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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 (idéal automne-hiver).