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Hokkawa Onsen

黒根岩風呂くろねいわふろ

Other
Chubu·Shizuoka

Day Use

Yes

Bathing & Water

Natural onsen water

Uses natural hot spring water

Outdoor BathYes

Open-air outdoor bath

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

Chloride
Color
nearly colorless and transparent
Taste
slightly salty
Odor
odorless

Chloride spring

pH 8.1Weakly alkalineHot source · 76°CHigh silica
Composition fingerprint3.8 g/kg dissolved · Hypotonic
Mg²⁺2
Cl⁻81
SO₄²⁻16
CationsAnions
Magnesium Mg²⁺
mild; a laxative if you drink it.
Chloride Cl⁻
table-salt anion — coats the skin and holds heat in.
Known good for
  • Warmingcold sensitivity
  • Aches & jointsstiff shoulders
  • Smooth skindry, rough skin

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.

Sampled at mixing tank·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.

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