Yūdoku Onsen
有毒温泉
A toxic volcanic caldera in Hokkaido where deadly gases prevent entry, best viewed from a safe distance while hiking.
What it is
- A hot spring site located at the bottom of the Ohachidaira Caldera in Kamikawa Town.
- A dangerous area that emits highly toxic hydrogen sulfide volcanic gas.
- A strictly prohibited zone where entry is forbidden due to lethal gas poisoning risks.
- The source of the Akaishi River which contains undrinkable water.
What to see
- The caldera floor where wild animals are frequently found dead from gas poisoning.
- The site of historical accidents including the deaths of students and a hiker.
- Views of the spring area from the safety of the Ohachidaira Observatory.
When to go
- July is the month when historical gas poisoning incidents were recorded.
Getting there
- Reach the Ohachidaira Observatory by hiking from Mount Kurodake.
- No roads provide access to the hot spring itself.
Notes written by Japan Gems from facts in Japanese Wikipedia.
Where it is
Yūdoku Onsen Open in Google Maps
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