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Hirayu Prince Hotel

平湯プリンスホテルひらゆプリンスホテル

Lodging

Day Use

Yes

When I called in advance, they didn’t say the time, and advised coming after 13:00

¥800

Bathing & Water

Natural onsen water

Uses natural hot spring water

Outdoor BathYes

Open-air outdoor bath

Indoor BathYes

Enclosed indoor bathing area

Policies & Services

WashingYes

Shower, wash stations, soap and shampoo provided

アカンダナの湯、湯上の湯と谷水との混合泉

Akandana-no-Yu and Yunoue-no-Yu Blended with Valley Water

Operated by · 平湯プリンスホテル

Mixed source

曹
Bicarbonate
+ Chloride
Color
colorless and transparent
Taste
faintly carbonic
Odor
faint hydrogen sulfide

Sodium-Calcium Bicarbonate-Chloride spring

pH 6.6NeutralHot source · 47°CHigh silica
Composition fingerprint1.1 g/kg dissolved · Hypotonic
Na⁺63
Ca²⁺22
HCO₃⁻56
Cl⁻37
◀ CationsAnions ▶
Sodium Na⁺
salt's cation — pairs with chloride to make the water salty.
Bicarbonate HCO₃⁻
"soda" — softens skin, leaves it smooth.
Known good for
  • Smooth skindry, rough skin
  • Aches & jointsstiff shoulders
  • Warmingcold sensitivity

A blended source: Akandana-no-Yu and Yunoue-no-Yu are combined with local valley water, and the certificate samples the mix at the hotel's mixing-tank outlet rather than at a wellhead. The result is a sodium-calcium bicarbonate-chloride water — the juso-sen style, soft on the skin — with a salt-tinged finish and a neutral pH that keeps it undemanding. It runs colorless and clear but carries a faint carbonic tang and a whisper of hydrogen sulfide, the fingerprint of 187 mg/kg of free CO₂ still dissolved in it. Metasilicic acid at 177.8 mg/kg puts it squarely in Japan's beauty-water family, leaving the kind of silica film that makes skin feel noticeably smoother afterwards.

Sampled at mixing tank·Analyzed Apr 30, 2015·株式会社神岡衛生社·Cert no. No.15-P-04029

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3.0

1 review

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SM
Sergey M
7 months ago

845. Hirayu Prince Hotel, Hirayu Onsen, Okuhida Onsen, Gifu ★ I went for a higaeri for ¥800. The higaeri slot was unclear, when I called ahead they did not say the time, they advised coming after 13:00. On Monday in March, they let me in at 15:45. 1. The rotenburo is set in stone. There is no view. The water is clear blue, with some lime. The temperature was 47.5, which is very unusual for hotel rotenburo of this type. There is a large stick for stirring the water. 2. The uchiyu. The water is clear, with occasional bubbles, and it has the proper sulfurous onsen smell. The temperature was 42. It is fine to breathe inside. A good place, with an unusually high temperature in the rotenburo. 09.03.2026

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Onsen OniSM@S

Last updated October 7, 2026