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Hachioji Onsen Tokyo

Hachioji, Tokyo Metropolis, Japan
Hachioji Onsen Tokyo
Location
Hachioji, Tokyo Metropolis, 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

Hachioji, in the western Tokyo Metropolis at the base of the Okutama mountain range, is the largest city by area in Tokyo with a population of over 600,000, home to twenty-one universities making it one of Japan's highest-density student cities, set where the Kanto plain meets the Tama foothills in a landscape of traditional silk weaving heritage and modern university culture. Hachioji Onsen Tokyo draws on chloride-rich thermal waters from the geological resources of the western Tokyo volcanic zone at the Kanto mountain fringe, offering restorative baths in a major western Tokyo city where the Hachioji matsuri festival — one of Tokyo's largest summer festivals with enormous painted festival floats — and the traditional Hachioji ori silk weaving craft create a distinctively cultural spa setting. The spectacular Hachioji Matsuri festival floats in August, the Shoin Jinja shrine commemorating loyalist scholar Yoshida Shoin, and the gateway access to the Okutama mountain wilderness — Tokyo Metropolis's surprisingly wild western mountain landscape — create a rewarding and accessible spa destination in western Tokyo.

Insider tip — Hachioji is the largest city in the Tokyo Metropolis outside the central wards, spreading across the Tama River hills where deep drilling yields saline waters from buried marine sediments. The sento here serves university students from several nearby campuses alongside longtime residents of the castle-town streets below Mount Takao. At 41°C the sodium-chloride bath delivers effective muscle relaxation after hiking the cedar forests of Takao-san. Late evenings offer the most atmospheric soaks, with the quietude of suburban Hachioji settling over the bath floor.
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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).