Onsen OniOnsen Oni

Yunokuni Kaikan

湯の国会館ゆのこっかいかん

Other
Chubu·Shizuoka
0558-87-1192yunokuni-izu.com

Day Use

Yes

Bathing & Water

OnsenYes

Uses natural hot spring water

青羽根2号、矢熊・青羽根3号

Aobane No. 2 and Yaguma-Aobane No. 3 (mixed)

Mixed source

Sampled at wellhead
湯
Simple
Classification

Sodium Sulfate-Bicarbonate spring

An alkaline simple thermal spring: hot at the wellhead (47 °C) yet only lightly mineralized at 791 mg/kg dissolved solids. At pH 9.0 it has the slippery, alkaline feel of Japan's beauty-water family, soft on the skin. Metasilicic acid is fairly generous at 111 mg/kg, leaving a thin silica film that smooths the skin. The water runs almost colorless and transparent, carrying a faint rotten-egg note of hydrogen sulfide.

pH
9.00
Alkaline
Source temperature
47.0°C
Hot
Tonicity
0.79g/kg
Hypotonic
Flow rate
115L/min
Typical
Color
almost colorless and transparent
Taste
faint hydrogen sulfide taste
Odor
faint hydrogen sulfide
Highlights
  • High silica

Analyzed Feb 8, 2024·一般財団法人静岡県生活科学検査センター·Cert no. 第M23031号

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SL
Slava
1 year ago

A higaeri spot. Very interesting alkaline water. The men's rotenburo has a river view. Rotenburo has 2 baths. One inside. Two saunas (hotter and regular) and a cold bath at 25 degrees :( The cold bath is interesting though! It's a reisen — a cold onsen. Photos from Google.

SM
Sergey M
1 year ago

249. Yunokuni Kaikan, Izu Public onsen for 1000, listed hours 10:00–21:00 (except Wed). They stamp the 60 Onsen of Shizuoka 24/25 booklet. Has a restaurant (tasty), a shop, and chill zones. Online photos match. 1. Indoor area, comfortable to breathe inside. 1.1. Rectangular bath with clear water, temperature 40. 1.2. Sauna. 1.3. Small cold bath. 2. Outdoor area. 2.1. Herbal bath with clear-greenish water. Temperature 38. There's a pleasant river view, although quite narrow. 2.2. Second outdoor bath. Clear water, temperature 39–40. Pleasant place. Worth visiting if you're nearby. The food was great too.