Onsen OniOnsen Oni

Search Onsen Oni

Search onsen, areas, prefectures and pages.

Yunohana Onsen Ishiyu

湯ノ花温泉 共同浴場 石湯ゆノはなおんせん きょうどうよくじょう いしゆ

A mixed communal bath built around a hollowed river boulder

Public Bathhouse
Yunohana Onsen
Tohoku·Fukushima
0241-64-5611kanko-aizu.com

Day Use

Yes
06:30–21:30
¥300

A bathing ticket (adult 300 yen, child 150 yen) is sold at nearby shops and inns rather than on site, and it covers same day entry to all four Yunohana communal baths.

Bathing & Water

Natural onsen water

Uses natural hot spring water

Indoor BathYes

Enclosed indoor bathing area

Bathing Arrangements

Mixed BathingYes

Shared bathing area for all genders

Policies & Services

WashingNo

Shower, wash stations, soap and shampoo provided

Equipment is a changing room only. The site states only Kobo no Yu, one of the other three baths, has a shower installed.

TowelsNo

Towels to rent or borrow at the desk

Unstaffed communal bath; tickets are bought off-site and the listed equipment is a changing room only, with no towel service mentioned.

Rest AreaNo

Relaxation space for after bathing

Only Kobo no Yu, a different one of the four baths, is described as having a rest area with lockers; Ishiyu's own listing is changing room only.

ParkingYes

On-site or nearby parking available

No dedicated lot; visitors are directed to park in front of Hoshi Shoten, a nearby shop, in an arrangement shared by all four communal baths.

石湯

Ishiyu

Operated by · 34人共有者代表 大山 信弥

湯
Simple
Color
colorless and transparent
Taste
tasteless
Odor
odorless

Sodium-Calcium Chloride-Bicarbonate spring

Composition fingerprint0.9 g/kg dissolved · Hypotonic
Na⁺68
Ca²⁺29
Cl⁻70
HCO₃⁻25
◀ CationsAnions ▶
Sodium Na⁺
salt's cation — pairs with chloride to make the water salty.
Chloride Cl⁻
table-salt anion — coats the skin and holds heat in.
Known good for
  • Smooth skindry, rough skin
  • Recoveryfatigue, stress

A weakly alkaline simple thermal spring rising at 36.7 °C, colourless and odourless with no notable taste — the kind of unfussy, low-irritation water that suits long soaks. Total dissolved solids sit at a light 890 mg/kg, with sodium and calcium leading the cations and chloride balanced against bicarbonate among the anions, so nothing dominates the chemistry. The pH of 8.5 lands in 'beauty-water' territory: mildly alkaline, soft on the skin, with a faintly slippery feel. The source feeds the Ishiyu communal bath in Yunohana Onsen — a self-flowing well, served plainly as a gentle, everyday hot spring rather than a high-mineral cure-water.

Sampled at wellhead·Analyzed Jul 6, 2015·株式会社 新潟温泉分析センター·Cert no. 08145号

Explore the water

About

Ishiyu (石湯, meaning stone bath) is one of four communal baths that make up Yunohana Onsen, on the bank of the river. The tub itself is a hollowed-out boulder, built right into the small shed around it. Bathing is fully mixed, though a partition blocks the sightline into the tub. The water comes straight off the source and runs continuously, but it arrives scalding hot: visitors often splash in buckets of water or work the surface with a wooden paddle before they can get in. A second, smaller tub fed only by the overflow runs cooler and is the easier way to actually soak. There's no shower, just a shared changing room, and no attendant on site. A small shrine sits on the rock above the water, and residents of the village look after the place day to day.

Loading map…

No reviews yet

Be the first to share your experience!

Onsen Oni

Last updated September 19, 2026