Hakone Tenzan Tonosawa (天山湯治郷)
하코네 텐잔 토노사와 (天山湯治郷)
Open-air onsen in Hakone — 7 springs, 100% undiluted
About this place
NotesA day-trip onsen in Hakone. Feel the changing seasons in natural open-air baths.
Practical notes
7 springs producing 500,000L a day, 100% undiluted kakenagashi. Two buildings, Tenzan and Ikkyu — Ikkyu is quieter if you just want the baths. Weekday hashigo-yu ticket (+¥300) covers both. There is also a drinking-spring corner and a reading room.
Compiled from publicly available information and visitor reports. The rating shown is an editorial summary of the same, and does not mean we have visited every place in person. Prices and hours may change — please confirm with the venue before visiting.
Before you go
EssentialsDiscounted tickets available
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Info updated: 2026-08
Details may differ from actual conditions.
What stands out
- +Open-air baths in nature
- +Various water quality baths
- +Day trip possible
Facility Details
Hakone Top Day-Trip Onsen · Natural Free-Flowing Source · Valley Outdoor Bath
Sauna
1Baths
4Rest Areas
1Facility details are verified and updated regularly, but may differ from actual conditions. Please confirm with the venue before visiting.
Same facility as hakone-tenzan-onsen - refer to that listing
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Nearby (5)
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Hakone Tenzan Tokinoyu (天山湯治郷)
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7 source springs in Hakone, 500,000 liters/day free-flowing open-air onsen
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Cheaper than walk-in · Mobile voucher