Mukuno, Suo-Oshima, Yamaguchi
Shioburo Hoyokan
This is a heated seawater bath with a sauna, not a natural hot spring. Its low admission and second-floor sea-view rest area make it a useful stop after outdoor activities or alongside a stay at Green Stay Nagaura.
Facility photos
Check before bathing
- Opening hours
- Ages 13 and over ¥520; local residents aged 65 and over ¥410; children aged four through elementary school ¥300; younger children free. Open 10:00–20:00, last entry 19:30; closed Tuesdays, or the following day when Tuesday is a holiday. Reviewed sources dated September 7, 2026, listed the facility as reopened after several summer mechanical closures; check for a same-day notice before making a special trip.
Spring & water temperature
- Spring classification
- Not a natural hot spring. The operator describes the signature bath as seawater drawn from around Suo-Oshima and heated for bathing.
- Water handling
- The facility also lists a plain-water bath, a rotating refresh bath and a sauna. These are not natural spring baths. Circulation and disinfection details for the seawater bath are not published in the current text sources reviewed.
How to read a bath profile
Spring-source temperature and actual bathing temperature are kept separate. Each score is shown independently for comparison rather than collapsed into one overall score.
