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Minami Ashigara Onsen

Minami Ashigara, Kanagawa Prefecture, Japan
Minami Ashigara Onsen
Location
Minami Ashigara, Kanagawa Prefecture, 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

Minami Ashigara Onsen is a thermal facility in Minami-Ashigara city in Kanagawa Prefecture, at the foot of the Ashigara Pass in the westernmost part of the prefecture where the Oyama mountain range meets the Fuji-Hakone volcanic zone — a landscape of volcanic ridges, cedar forests, and the distant profile of Mount Fuji visible on clear days above the Ashigara Plain. The Ashigara area is famous as the homeland of the legendary Kintoki (Kintarō), the supernatural hero of Japanese folklore born in these mountains and raised by a mountain witch, who grew up to become one of the retainers of the warrior Minamoto no Yorimitsu — a myth embedded in the landscape of waterfalls, cedar forests, and rugged mountain trails that surround the onsen. The siliceous waters of Minami Ashigara Onsen provide restorative bathing in a mountain landscape charged with both volcanic geological energy and the folkloric imagination that has made the Ashigara highlands a place of legend in the Japanese cultural heritage.

Insider tip — Minami Ashigara Onsen lies at the southern foot of the Hakone volcano range, where bicarbonate-rich waters seep through the Ashigara plains. The area provides classic views of Mt. Fuji visible above the Hakone caldera rim from outdoor baths on clear mornings. Local spa facilities blend into a landscape of mandarin orchards and historic post-town architecture along the old Tokaido road. The waters at around 40°C have a soft, mildly alkaline character well suited to long soaking sessions.
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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).