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♨️A Century of Steam Rising From a Secret Mountaintop Bath

Akita · Fukenoyu Onsen

1

Hachimantai's Oldest Secret Bath

• ⛰️A lone, remote inn near the summit of Mt. Hachimantai, at roughly 1,100 meters elevation
• 📜Opened about 400 years ago, the oldest hot spring on Hachimantai
• ❄️Closed in winter due to heavy snow, open only from late April to early November

2

Open-Air Yaten-buro Baths Amid the Steam

• 🌫️Open-air baths scattered across a geothermal field where steam constantly rises from cracks in the rock
• 🧖5 open-air yaten-buro baths, split between mixed-gender and women-only
• 🏞️From the elevated inn, take in a full view of the steaming baths below

3

Three Faces of the Mixed Bathing Pool

• 🟫"Masu-buro," partitioned into a lattice of square pools
• 🛢️"Taru-buro," made from repurposed miso barrels
• 🪨"Iwa-buro," built up from large stacked rocks

4

Milky-White Sulfur Spring, Flowing Free

• 🥛Soft, milky-white water with abundant floating yunohana flakes
• 💧A simple spring and simple sulfur spring, cooled down from a source temperature of 78–93°C
• 🌊Kakenagashi style — no dilution, no recirculation, just source water flowing through

5

Hinoki Indoor Baths and Rooms

• 🌲Two hinoki cypress indoor baths for soaking
• 🛏️A two-story wooden building with 21 rooms, 7 of them with an en-suite toilet
• 📺Free Wi-Fi, yukata, TV, and hair dryer provided in every room

6

Facilities for a Full Day at the Summit

• ♨️Day-trip bathing available 10:00–15:00 (700 yen for adults)
• 🅿️Free parking, and 1 wheelchair-accessible room
• 🍳One night with breakfast and dinner runs about 14,300–22,000 yen per person

A secret bath near the summit of Mt. Hachimantai that only opens in late spring, once the snow-locked winter has passed. Three open-air baths — masu, taru, and iwa — sit scattered across a steam-shrouded geothermal field, where you can soak in milky-white sulfur water flowing for 400 years and take in the stillness of the mountaintop.

#Fukenoyu#MushinoyuOnsen#Hachimantai#AkitaOnsen#HiddenHotSpring#OpenAirBath#SulfurSpring#JapanSecretOnsenSociety

* This introduction was compiled from information published by each property (official website and similar sources), so some details may differ from what you find on the day. It is AI-assisted and can contain errors — please check the official website and the details shown at booking before you reserve.

From onsen etiquette to check-in — the things worth knowing first.

Check In/Check Out Policy · Check In: 15:00 · Check Out: 10:00 · Last Check In: 18:00

* These policies are the property's own text, in English; the cancellation policy shown at booking takes precedence.