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Hanbara Onsen

Sagamihara, Kanagawa, Japan
Hanbara Onsen
Location
Sagamihara, Kanagawa, Japan
Water type
thermal
Temperature
38 °C
pH
7.3

Water profile

Thermicity
Neutral
38 °C
LowHigh

Soothing — neither hot nor cold, perfect balance.

Mineralisation
Balancing
LowHigh

Rich in trace elements — gentle on the skin.

Buoyancy
Standard buoyancy
LowHigh

Soft water — natural, classic buoyancy.

BicarbonatesCalcium

Hanbara Onsen is a hot spring in Japan whose oligometallic mineral waters represent the lightest and most delicate category in the Japanese therapeutic hot spring classification, being almost devoid of mineral salts yet still possessing the warmth and gentle cleansing properties that make thermal bathing beneficial for sensitive skin, convalescent patients, and those seeking the mildest possible form of therapeutic bathing. Oligometallic springs are particularly valued in Japanese medicine for their suitability for children, the elderly, and those with skin conditions who might react adversely to more heavily mineralized waters, and they are often found at high altitudes where the water has traveled through less soluble rock formations. The pure and gentle character of the Hanbara Onsen waters makes this a welcoming therapeutic destination for a broad range of visitors seeking the restorative benefits of Japanese hot spring bathing without the intensity of more strongly mineralized spring types.

Insider tip — Hanbara Onsen in the Sagamihara region of western Kanagawa lies in the forested hills along the Sagami river, near the Tanzawa mountains and within day-trip reach of Tokyo. The mild oligomineral springs serve a landscape where the Kanto plain rises into mountain country, providing accessible hot-spring relaxation in the green hills west of the capital — a quiet rural counterpoint to the vast metropolis of Greater Tokyo just to the east.
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Frequently asked questions

How hot is the water?
The water is neutral here, around 38 °C — a perfect balance, neither too hot nor too cold.
What type of water is found here?
This spot features thermal water.
What is the best season to visit?
The most favourable period for this spot is: Toute l'année.