Onsen OniOnsen Oni

Public Bath No.4 Take-no-yu

四番湯 竹の湯よんばんゆ たけのゆ

Public Bathhouse
Yudanaka–Shibu Onsen-kyoShibu Onsen
Chubu·Nagano
0269-33-2921shibuonsen.net

Day Use

Yes

Bathing & Water

Outdoor BathNo

Open-air outdoor bath

Indoor BathYes

Enclosed indoor bathing area

SaunaNo

Dry heat sauna room

Cold BathNo

Cold water plunge bath, typically used after sauna

OnsenYes

Uses natural hot spring water

Capabilities

Private BathNo

Private bath available for day-use visitors or hotel guests to reserve

Room OnsenNo

Private onsen bath in guest rooms, for overnight guests only

Mixed BathingNo

Shared bathing area for all genders

横湯第一ボーリング、横湯第二ボーリング、熱の湯の混合泉

Yokoyu No.1 Boring, Yokoyu No.2 Boring & Netsu-no-yu Mixed Spring

Mixed source

Sampled at bath inlet
塩
Chloride
+ Sulfate
Classification

Sodium-Calcium Chloride-Sulfate spring

A sodium-calcium chloride-sulfate spring blended from three Yokoyu wells. Weakly alkaline and soft on the skin, the water is almost colorless and transparent yet carries a faint salty, sulfurous edge. The source emerges scaldingly hot at 86.5 °C, among Japan's hottest, and its 199 mg/kg of metasilicic acid leaves a thin silica film for noticeably smoother skin.

pH
8.00
Weakly alkaline
Source temperature
86.5°C
Hot
Tonicity
1.61g/kg
Hypotonic
Free CO₂
2.30mg/kg
Low
Free H₂S
0.07mg/kg
Low
Color
almost colorless and transparent
Taste
slightly salty with a faint sulfur note
Highlights
  • Top-decile hot
  • High silica

Analyzed May 26, 2016·一般社団法人 上田薬剤師会 検査センター·Cert no. No.427

Programs

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SM
Sergey M
2 years ago

Public Bath No.4 Take-no-yu, Shibu onsen 4th onsen of Shibu. Very old-school. Went in the evening and the temperature was absolutely nuclear - couldn't even dip a foot in without adding cold water. And I had to add cold water and stir for about 10 minutes just to be able to get in (but it was still very hot). Later at another onsen I met a foreign tourist who also acknowledged the insane temperature at this bath and showed his parboiled shins (apparently he waited less than I did for a reasonable temperature). Water is clear, I don't really remember the smell. Given the temperature experience and the process of cooling it down - a very interesting onsen, but absolutely make sure to approach the water temperature sensibly to avoid injury.