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Hakoneyumoto Onsen Ashinoyu

Hakone, Kanagawa, Japan
Hakoneyumoto Onsen Ashinoyu
Location
Hakone, Kanagawa, Japan
Water type
sulfurous
Temperature
44 °C
pH
6.5

Water profile

Thermicity
Sedative
44 °C
LowHigh

Relaxing — deep, immediate muscle release.

Mineralisation
Bio-active
LowHigh

Rich in active gases or metals — a strong mineral character.

Buoyancy
Standard buoyancy
LowHigh

Soft water — natural, classic buoyancy.

SoufreSulfuresSulfates

Hakoneyumoto Onsen Ashinoyu is located in the Hakone area of Kanagawa Prefecture, within the Hakone-Ashinoko Quasi-National Park — the outer rim of the Hakone caldera, a collapsed volcanic crater whose hot springs, geysers, and fumaroles have made it one of Japan's most visited spa destinations and whose position just 80 kilometres from Tokyo makes it the most accessible major volcanic onsen area for Japan's largest metropolitan population. The sulphurous thermal waters characteristic of the Hakone volcanic zone emerge from fumarolic venting associated with the Owakudani (Great Boiling Valley) geothermal area — where eggs boiled black in sulphurous springs are a famous local delicacy — and are appreciated within a long thermal tradition. Ashinoyu's position overlooking Lake Ashi, the caldera lake with its iconic views of Mount Fuji reflected in still water alongside red torii gates rising from the lake — one of Japan's most reproduced visual images — makes this one of the most scenically celebrated thermal destinations in all of Japan.

Insider tip — Hakoneyumoto is the gateway to the Hakone volcanic zone where sulfurous steam vents from fumaroles across the caldera. The milky sulfurous waters of Ashinoyu are among the most classically volcanic in the Kanto region. This area has been a retreat for Edo-era travelers on the Tokaido highway, and the historic atmosphere is still palpable. Arrive early to beat day-trippers from Tokyo.
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Frequently asked questions

How hot is the water?
The water runs quite hot here, around 44 °C — a sedative water that brings immediate muscle release.
What type of water is found here?
This spot features sulfurous water.
What is the best season to visit?
The most favourable period for this spot is: Toute l'année (idéal automne-hiver).