産山温泉 奥阿蘇の宿 やまなみうぶやまおんせん おくあそのやど やまなみ
Day-use bathing runs 10:30-15:00, with last entry at 14:00, and the inn may have to turn day visitors away while the baths are being cleaned.
700 yen for the main bath (indoor kabocha-yu and outdoor shiki no yu); a family/private bath can also be reserved for 2,500 yen per hour in the same 10:30-15:00 window.
Uses natural hot spring water
Open-air outdoor bath
Enclosed indoor bathing area
Private bath available for day-use visitors or hotel guests to reserve
Private onsen bath in guest rooms, for overnight guests only
Shared bathing area for all genders
Welcomes children and families
Child rates listed for infants and elementary-school-age children.
Relaxation space for after bathing
On-site or nearby parking available
Yamanami is a hot-spring ryokan built into a hundred-year-old farmhouse, or kominka (古民家), on a small river in Ubuyama village, in the Aso-Kuju highlands of Kumamoto. The owner dug the spring himself and built the baths by hand: an indoor bath called kabocha-yu (かぼちゃ湯), walled in stacked stone, and an outdoor rotenburo, shiki no yu (四季の湯), that looks straight out onto the trees. The two alternate between men and women through the day, and the water runs in fresh around the clock rather than being recirculated (kakenagashi, 掛け流し). It is soft, silky water, the kind reviewers keep saying leaves skin smooth with no lotion needed after. Three smaller family baths round things out, wood barrels and stone-built among them, and a couple of rooms come with their own private open-air bath. The place still feels like the old farmhouse it is: you cross a small footbridge over the river from the parking lot, then worn wood floors and quiet but for the stream and birds outside. There is an outdoor irori (囲炉裏, fire pit) to sit by after a soak. Dinner runs on local wild vegetables, and the proprietress is known for the dozens of homemade pickles she puts out with it.
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Last updated July 17, 2026