Hokkawa Onsen

黒根岩風呂くろねいわふろ

Other
Chubu·Shizuoka

Day Use

Yes

Bathing & Water

Outdoor BathYes

Open-air outdoor bath

OnsenYes

Uses natural hot spring water

混合泉(混合タンク)

Blended Source (mixing tank)

Operated by · 株式会社つるやホテル

Mixed source

Sampled at mixing tank
Chloride
Classification

Chloride spring

A sodium-calcium chloride spring drawn at a mixing tank from a very hot 76 °C source. Weakly alkaline and soft on the skin, it is nearly colorless and transparent with a faintly salty finish on the lips. It is one of the hotter natural sources, and carries around 131 mg/kg of metasilicic acid that helps leave skin feeling smoother.

pH
8.10
Weakly alkaline
Source temperature
76.0°C
Hot
Tonicity
3.82g/kg
Hypotonic
Free CO₂
8.80mg/kg
Low
Color
nearly colorless and transparent
Taste
slightly salty
Odor
odorless
Highlights
  • Top-decile hot
  • High silica

Analyzed Oct 18, 2014·一般財団法人静岡県生活科学検査センター·Cert no. 第M14029号

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SM
Sergey M
1 year ago

242. Hokkawa Onsen, Izu An onsen well-known among those in the know. The bath edges are positioned close to the bay — very beautiful. Costs 600, listed hours 10:00–18:00. Online photos match. Inside there are two stone baths with clear water. Temperature: one bath at 40, the other 41–42. Strong wind blowing from the bay side, quite refreshing. No question about it — a very cool, authentic onsen, a must-visit.