Okunoyu is right next to Oyunuma in Noboribetsu. The water temperature reaches 75–80°C, and the color is a beautiful emerald green. You can't bathe here, but you can really feel the heat and smell the sulfur up close. It's a pretty unique experience!
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Okunoyu (Noboribetsu Onsen)
One of the natural hot spring sources of Noboribetsu Onsen, Okunoyu resembles a boiling cauldron, bubbling with intense geothermal energy.
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Okunoyu is one of the many hot spring sources that make up the famous Noboribetsu Onsen, known for its diverse mineral-rich waters. This striking site is part of the explosion crater remnants of the still-active Mt. Hiyoriyama.
From the cone-shaped basin at the bottom—called a fuki—gray-black sulfur springs erupt violently, creating the image of a boiling cauldron. The surface temperature of the pond reaches between 75°C and 85°C, and the powerful bursts near the front and center are especially impressive.
Surrounded by rising steam and the strong scent of sulfur, visitors can fully immerse themselves in the unique atmosphere of a hot spring area.
Located within walking distance from Jigokudani (Hell Valley) and Oyunuma, the area is equipped with walking trails, allowing guests to enjoy scenic strolls and forest bathing as they explore this natural wonder.
Highlights
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One of the natural hot spring sources of Noboribetsu Onsen.
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The surface temperature of the pond reaches 75°C to 85°C.
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Visitors can witness the intense bubbling, resembling a boiling cauldron.
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Well-maintained walking trails make the surrounding area perfect for a scenic stroll.
Photos
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Part of the explosion crater remains of Mt. Hiyoriyama
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Sulfur-rich hot spring water erupts powerfully from the ground
Reviews
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Details
- Name in Japanese
- 奥の湯
- Postal Code
- 059-0551
- Address
- Noboribetsuonsencho, Noboribetsu City, Hokkaido
- Telephone
- 0143-84-3311(Noboribetsu International Tourism and Convention Association)
- Closed
- Free to walk
- Business Hours
- Walk anytime
- Admission
- Free
- Access
- From JR Noboribetsu Station, take a bus to “Park Hotel-mae” and walk approximately 20 minutes.
- Official Website
- Official Website (Japanese)