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Tsukahara Onsen Kakono Izumi
4.2★ · 1033 Google ratings · Yufu, Oita · 塚原温泉 火口乃泉
✓ Private day-use bath✓ Natural hot-spring water✓ Free-flowing source water✓ Outdoor bath✓ Rest area
Before you go
Can you bathe here?
Day visitors
✓ YesThe facility functions as a day-use bath with posted admission fees and reception hours reported across 2026-03 to 2026-05.stated by 3 visitors · Mar 2026 – May 2026
Hours
09:00–17:00from the facility listing
Private bath
✓ YesFamily (rental) baths are available, though reviewers from 2026-04 to 2026-08 note they can be busy and require waiting.stated by 3 visitors · May 2026 – Aug 2026
Tattoos
Not known · call aheadno policy stated in the 30 recent reviews we read or on the facility's website
Watch out
pH
Multiple reviewers from 2026-04 to 2026-06 cite a measured pH of about 1.4, among the most acidic in Japan.
stated by 3 visitors · Jun 2026 – Aug 2026Soap & shampoo
Many visitors from 2026-03 to 2026-06 report soap and shampoo cannot be used due to the strong acidity of the water.
stated by 3 visitors · Apr 2026 – Jun 2026Spring type
Reviewers from 2026-04 to 2026-09 describe a very strong acidic spring with a sour lemon-like taste and high iron content.
stated by 3 visitors · Apr 2026 – Sep 2026The bath
What you’ll find
A remote, extremely acidic (pH about 1.4) volcanic hot spring bath near the Tsukahara crater in Oita, with separate indoor and outdoor baths and family baths, where visitors soak only—no soap or shampoo is usable.
Outdoor bath
✓ YesNumerous reviewers from 2026-03 to 2026-08 describe using a separate outdoor bath in addition to the indoor bath.stated by 3 visitors · Jun 2026 – Aug 2026
Indoor baths
1One indoor bath is provided per gender according to a 2026-04 review.stated by 1 visitor · Apr 2026
The water
Free-flowing (kakenagashi)
✓ YesReviewers in 2026-03 and 2026-04 describe the bath as source-fed kakenagashi.stated by 2 visitors · Mar 2026 – Apr 2026
Spring type
Strong acidic sulfur-iron springReviewers from 2026-04 to 2026-09 describe a very strong acidic spring with a sour lemon-like taste and high iron content.stated by 3 visitors · Apr 2026 – Sep 2026
pH
pH 1.4Multiple reviewers from 2026-04 to 2026-06 cite a measured pH of about 1.4, among the most acidic in Japan.stated by 3 visitors · Jun 2026 – Aug 2026
Practical
What to bring
Soap & shampoo
Not provided — bring your ownMany visitors from 2026-03 to 2026-06 report soap and shampoo cannot be used due to the strong acidity of the water.stated by 3 visitors · Apr 2026 – Jun 2026
Timing
When to go
Quietest Monday around 9:00; busiest Sunday around 12:00. Measured by Google over past visits, not a forecast.
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Quiet Busy
| Day | Hours |
|---|---|
| Monday | 09:00–17:00 |
| Tuesday | 09:00–17:00 |
| Wednesday | 09:00–17:00 |
| Thursday | 09:00–17:00 |
| Friday | 09:00–17:00 |
| Saturday | 09:00–17:00 |
| Sunday | 09:00–17:00 |
Practical
Plan your visit
📍 1235 Yufuincho Tsukahara, Yufu, Oita 879-5101
🚃 Kamegawa station, 6.9 km
📞 +81977-85-4101
📋 Show at the counter: 塚原温泉 火口乃泉
Nearby
Other baths close by
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