Onsen OniOnsen Oni

Unzen Onsen Seiunso

雲仙温泉 青雲荘うんぜんおんせん せいうんそう

Lodging
Kojigoku Onsen
Kyushu & Okinawa·Nagasaki
0957-73-3273seiunso.jp

Day Use

Yes

Policies & Services

TowelsYes

Towels available to rent or borrow

Water treatment

from Article 18 disclosure
  • Added water
    Not disclosed
  • Reheated
    Not disclosed
  • Recirculated
    Not disclosed
  • Disinfected
    Not disclosed
  • Bath additives
    Not disclosed

雲仙温泉（小地獄）

Unzen Onsen (Kojigoku)

Operated by · 株式会社 青雲荘

Sampled at wellhead
黄
Sulfur
Classification

Calcium-Sodium Sulfate spring

A simple sulfur spring of the hydrogen-sulfide type rising at Kojigoku in Unzen. At the source the water is milky and slightly turbid, with a faintly acidic taste and the characteristic rotten-egg note of H₂S. It is a weakly acidic, hot spring carrying 80.5 mg/kg of metasilicic acid, which leaves the skin smooth. The posted indications cover neuralgia, muscle and joint pain, sensitivity to cold and recovery from fatigue. Because the source temperature is high, fresh water may be added to cool it.

pH
3.85
Weakly acidic
Source temperature
63.5°C
Hot
Tonicity
0.24g/kg
Hypotonic
Free CO₂
239mg/kg
Low
Free H₂S
3.50mg/kg
High
Color
milky white, slightly turbid
Taste
slightly acidic
Odor
faint hydrogen sulfide
Highlights
  • High silica
  • Sulfur-rich

Analyzed Oct 29, 2009·財団法人 佐賀県環境科学検査協会·Cert no. 佐環検温第24号

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SM
Sergey M
2 years ago

Unzen Onsen Seiunso, Unzen (Pt.2 - private baths) For day-use, you can get private baths for an extra fee (2,500 yen for 50 min, choice of one of two). Inside they're different - the first is simpler, the second is more stylish and larger. But the water in the second one is really hot, for those who like it that way. Otherwise, the water seems similar. Breathing is comfortable in both.

SM
Sergey M
2 years ago

Unzen Onsen Seiunso, Unzen (Pt.1 - indoor and outdoor bath) A relatively modern ryokan, the bath entrance is on the first floor. For day-use until 18:00, all baths are available - indoor plus exit to a small outdoor bath, and a separate outdoor bath. Cost with large towel rental is 1,250 yen for everything. The water is milky blue, not much smell, good temperature, comfortable breathing. In the indoor bath there are several grooves for your body and head where you can lie down comfortably. Through the indoor bath you can exit to a small outdoor area with two small single-person baths. The outdoor bath water seemed similar, it's on a kind of large "balcony." Highly recommend.