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Ayase Onsen Kanagawa

Ayase, Kanagawa (Kanto), Japan
Ayase Onsen Kanagawa
Location
Ayase, Kanagawa (Kanto), 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

Ayase, in the central Kanagawa Prefecture plain between Yokohama and Sagamihara, is a suburban city known for its Self-Defence Force Atsugi Naval Air Facility and the traditional agricultural landscape of the Sakai River valley, a community that has balanced military base proximity with suburban residential development in the broad Kanagawa plain. Ayase Onsen Kanagawa draws on chloride-rich thermal waters from the geological resources of the Kanagawa coastal plain, offering warm restorative baths in a suburban community whose Self-Defence Force heritage, agricultural plain setting, and convenient rail access to Yokohama and Shinjuku create a practically located and accessible spa destination. The Atsugi Naval Air Facility air shows held periodically for the public, the Sakai River cycling paths through the flat Kanagawa suburban plain, and the easy Odakyu Line access to central Yokohama and the Shinjuku-Odawara rail corridor make Ayase a conveniently located suburban spa retreat in central Kanagawa Prefecture.

Insider tip — Ayase is an industrious city on the Sagami Plain, east of Odawara and close to Kanagawa's Self-Defense Force base, giving it a no-nonsense working-town character. Its sodium-chloride sento draws deep saline water that warms the muscles and is especially popular with factory and base workers after long shifts. The no-frills neighbourhood atmosphere is part of the authentic appeal.
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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).