Ubako Onsen, Hot spring in Hakone, Japan.
Ubako Onsen is a hot spring located at the highest point of a volcanic cone within the Hakone caldera, offering mineral-rich waters containing calcium and sodium sulphate compounds. The spring welcomes visitors year-round for both day trips and overnight stays.
The spring has been known since the Edo period as a place for healing and is part of a group of 17 hot springs in the Hakone area. It has a long tradition of therapeutic use within this volcanic landscape.
The spring earned its reputation through an old story about someone whose injured eye healed after bathing here. People visit today because many believe the water helps with eye troubles.
The onsen is reachable by the Izu-Hakone Bus from Hakone Yumoto Station to the Ubako Bus Stop. The location allows for casual visits and requires no special planning beyond figuring out transportation.
The water has a special mineral makeup that makes it particularly suited for eye conditions, setting it apart from other springs in the volcanic region. This property has proven itself over centuries and still draws people seeking this particular remedy today.
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