Muro No Yu

牟婁の湯むろのゆ

Public Bathhouse
Kansai·Wakayama

Day Use

Yes

Bathing & Water

OnsenYes

Uses natural hot spring water

礒崎2号

Isozaki Spring #2

Operated by · 白浜町長 井澗 誠

Sampled at wellhead
Chloride
+ 含硫黄
Classification

Sodium Chloride spring

A high-temperature sulfur-bearing sodium chloride strong-salt spring (74 °C at source) from Wakayama's Shirahama coast. Strongly mineralized at roughly 20 g/kg dissolved solids, it leaves the distinct mineral coating of a 'kyō-en-sen' on the skin. Classified as sulfur-bearing ('sulfur-bearing') thanks to trace H₂S, and carries a fair load of metasilicic acid (79.5 mg/kg) for a softer skin-feel beneath the salt.

Source temperature
74.0°C
Hot
Tonicity
19.94g/kg
Hypertonic
Flow rate
190L/min
Typical
Free CO₂
299mg/kg
Typical
Free H₂S
1.20mg/kg
Typical
Color
colourless
Taste
moderately salty
Odor
odourless
Highlights
  • Strong salt
  • Top-decile hot
  • High silica

Analyzed Aug 18, 2017·一般社団法人 和歌山県薬剤師会 医薬品・公衆衛生検査センター·Cert no. 第E1708045号

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SM
Sergey M
4 months ago

678. Muro-no-Yu, Shirahama, Wakayama Onsen for 420 (visited on the tegate pass). Operating hours are 07:00-11:00 and 14:00-21:30 (except Tue). Included in the Shirahama tegate (1 sticker for 2 people). Two baths inside. Each bath uses water from a different source. Clear water, temperatures of 42 and 42.5 respectively. 09.11.2025