Rich in active gases or metals — a strong mineral character.
Buoyancy
Standard buoyancy
LowHigh
Soft water — natural, classic buoyancy.
SoufreSulfuresSulfates
Oyu Onsen Izumi no Yu is set in Kazuno, Akita Prefecture, in the Tohoku region. Its sulfurous water reaches 44°C and serves an indoor bath, an outdoor rotenburo pool and a sauna.
Insider tip — Izumi no Yu serves the Oyu Onsen district of Kazuno City, where the Oyu Stone Circles — two concentric rings of standing stones arranged in a solar calendar pattern 4,000 years ago by Jomon communities — are among Japan most important prehistoric monuments and central to the UNESCO Jomon Prehistoric Sites nomination. The sulfurous springs of Oyu share their volcanic heritage with the Lake Towada caldera just to the north, part of the Towada-Hachimantai volcanic system.