Yunominesou

湯の峯荘ゆのみねそう

Lodging

Day Use

Yes

Bathing & Water

OnsenYes

Uses natural hot spring water

元湯・峯ノ湯混合

Motoyu and Mine-no-yu Blend

Operated by · 田辺市四村川財産区 管理者 真砂充敏

Mixed source

Sampled at wellhead
Sulfur
+ Bicarbonate · Chloride
Classification

Sodium Bicarbonate-Chloride spring

A blended sulfur-bearing sodium bicarbonate-chloride spring drawing on the Motoyu and Mine-no-yu wellheads. It emerges very hot at 83.2 °C — among Japan's hottest natural sources — carrying the unmistakable rotten-egg note of H2S and a faintly sulfurous edge on the tongue. Total sulfur sits at 5.4 mg/kg and bicarbonate makes up roughly two-thirds of the anion budget, layering jūsō-sen softness with a quiet salty finish over the dominant sulfur character.

pH
6.70
Neutral
Source temperature
83.2°C
Hot
Tonicity
1.70g/kg
Hypotonic
Free CO₂
44mg/kg
Low
Free H₂S
3.10mg/kg
High
Color
colorless and transparent
Taste
faintly sulfurous
Odor
hydrogen sulfide
Highlights
  • Sulfur-rich
  • Top-decile hot

Analyzed Mar 19, 2025·一般社団法人 和歌山県薬剤師会 医薬品・公衆衛生検査センター·Cert no. 第E2502302号

Programs

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SM
Sergey M
11 months ago

602. Yunominesou, Yunomine Onsen, Wakayama ★★ Visited for higaeri at 1000 yen, they give a small towel. Higaeri hours from 12:00 to 15:00. Higaeri with meals also available from 15:00 to 21:00 for 7850-12250 yen (didn't take it). Private baths also available on a first-come-first-served basis with higaeri. They stamp the Wakayama 88 Onsen book. They sell the Wakayama 12 Onsen stamp. Baths rotate between male/female at 22:00. 1. Outdoor area. View of trees and forest through a fence. If you sit in the bath, the fence blocks the view. 1.1. First stone bath with clear water and a slight proper sulfurous onsen smell. Temperature around 43°C. 1.2. Second stone bath with clear water and a slight proper sulfurous onsen smell. Temperature around 39.5°C. 2. Indoor bath with clear water and a proper sulfurous onsen smell. Temperature around 43°C. Breathing inside is tolerable. 3. First indoor private bath. Slightly cloudy clear water. Slight proper sulfurous onsen smell. Temperature around 42°C. Breathing inside is fine. 4. Second indoor private bath. Slightly cloudy clear water. Slight proper sulfurous onsen smell. Temperature around 43°C. Breathing inside is tolerable. Great place. Even though the fence in the rotenburo is a hindrance, the overall combination of factors still makes it recommended. 13.06.2025