Ubako Onsen

Ubako Onsen sits at the highest point of the volcanic cone within the Hakone caldera, offering mineral-rich waters containing calcium and sodium sulphate compounds.

The spring belongs to the historical collection of 17 hot springs in Hakone, with records indicating its use during the Edo period for therapeutic purposes.

The spring gained recognition through the tale of Sataka Kintoki, who reportedly healed his injured eye using these waters, leading to its reputation for eye treatments.

Visitors reach the onsen via the Izu Hakone Bus from Hakone Yumoto Station to Ubako Bus Stop, with both day visits and overnight stays available throughout the year.

The mineral composition of Ubako Onsen specifically targets eye conditions, distinguishing it from other springs within the Hakone volcanic system.

Location: Hakone

Part of: Hakone Onsen

GPS coordinates: 35.24306,139.00944

Latest update: September 18, 2025 12:28