Bathers buried in hot volcanic sand on the beach at Ibusuki

Ibusuki Sunamushi Onsen Saraku

Japan's signature sand steam bath, where geothermal heat rises through a black volcanic beach.

Photo: Takasunrise0921, Wikimedia Commons

Bathing: Indoor / Outdoor
Established: 1987

At Ibusuki, on the southern tip of Kyushu, geothermal water heats the sand of the shoreline. Bathers lie in a shallow trench on the beach and attendants shovel hot sand over them — a practice documented here for around three centuries. Saraku is the municipal facility on the seafront.

Balnevia view

Why visit

Sunamushi onsen is unique to a handful of places on earth, and Ibusuki is its home. Fifteen minutes buried in heavy, radiating sand feels nothing like a hot pool, and the setting — open sea and volcanic ridge — is remarkable.

The water

Thermal water

Source: Ibusuki coastal geothermal field
Mineralisation: Sodium chloride hot spring
Character: Geothermal water heats the beach sand itself; bathers are buried in sand rather than immersed in water.

Practical information

You wear a supplied yukata; sand sessions last about ten to fifteen minutes, followed by indoor hot-spring baths to rinse. Tide and weather can move sessions under a covered area.