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Iyashi no Sato Kiyashiki

いやしの里 樹やしきいやしのさと きやしき

Lodging
Kyushu & Okinawa·Kumamoto

Day Use

Yes
11:00–20:00

There are shortened hours (from 12:30) and days off.

Bathing & Water

Natural onsen water

Uses natural hot spring water

Outdoor BathYes

Open-air outdoor bath

Indoor BathYes

Enclosed indoor bathing area

Capabilities

Private BathYes

Private bath available for day-use visitors or hotel guests to reserve

Room OnsenYes

Private onsen bath in guest rooms, for overnight guests only

樹やしき 源泉

Kiyashiki Onsen Spring

Operated by · いやしの里 樹やしき

Drinkable
Sulfur
Color
colorless and transparent
Taste
moderately sulfurous
Odor
moderate hydrogen sulfide

Sodium Sulfate-Chloride spring

pH 5.5Weakly acidicHot source · 85°CSulfur-richHigh silica
Composition fingerprint0.6 g/kg dissolved · Hypotonic
Na⁺67
Ca²⁺15
SO₄²⁻64
Cl⁻30
CationsAnions
Sodium Na⁺
salt's cation — pairs with chloride to make the water salty.
Sulfate SO₄²⁻
"gypsum / Glauber's salt" — vessels and wound healing.
Known good for
  • Skin conditionsatopic skin, eczema
  • Circulationtired legs
  • Aches & jointsstiff shoulders
  • Sensitive-skin cautionbroken or dry skin

An 85 C simple sulfur spring of the hydrogen sulfide type, served from one of Kyushu's hotter wellheads. Weakly acidic at pH 5.4, the water carries a distinct moderate sulfur taste and the unmistakable rotten-egg note of H₂S at the source. Total sulfur is 7.8 mg/kg with free H₂S at 7.5 mg/kg, and a generous 164.6 mg/kg of metasilicic acid layers in a faintly silky finish on the skin.

Sampled at wellhead·Analyzed May 17, 2017·株式会社 同人グローカル

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4.0

2 reviews

from 1 reviewer

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Sergey M
1 year ago

414. Iyashi no Sato Kiyashiki, Kurokawa Onsen ★★ Looks just as pleasant in daylight. 08.04.2025

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Sergey M
1 year ago· edited

414. Iyashi no Sato Kiyashiki, Kurokawa Onsen ★★ Visited for a day trip. Located away from the center of Kurokawa. Day trips are usually available from 13:00 to 18:00 (Wed-Sat) and from 11:00 to 18:00 (Sun-Tue), with occasional days off during the week. It is part of the Kurokawa tegata (discount pass). For overnight guests, there are two semi-open private baths. The ryokan provides its own branded towels. In all baths, the water is clear with pieces of white lime, sometimes large. 1. Indoor bath, temperature around 43°C. Comfortable to breathe inside. 2. Outdoor round bath, temperature around 43°C. 3. Outdoor square standing bath, temperature around 42°C. 4. Large outdoor bath, temperature around 40-41°C. View of the trees. A decent rotenburo (outdoor bath) with added options of standing and round baths. Worth visiting on the way; making a special detour to this onsen is not very practical given the competition in the village. 13.01.2025

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Alexey Rozin

1 year ago

Higaeri is available. Located far from central Kurokawa; I stopped by on my way to Yamamizuki. There's an indoor bath with a shower (strange smell in there) and beyond that, three different rotenburo in one space - two small ones (wooden and deep) and one large. They're all decent enough, but the view is mostly fence and tall trees. A questionable option. Not worth trekking 15 minutes specifically for it, but if you're passing by in that direction and have time, you can pop in.

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Onsen Oni

Last updated June 19, 2026