Onsen OniOnsen Oni

Ryokan Ryukeien

田の原温泉 旅館 流憩園

Lodging
Tanoharu Onsen
Kyushu & Okinawa·Kumamoto
+81 967-44-0671instagram.com

Day Use

Yes
08:00–11:00, 13:00–15:00, 18:00–20:00
¥500

Bathing & Water

Outdoor BathYes

Open-air outdoor bath

OnsenYes

Uses natural hot spring water

Capabilities

Private BathYes

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

黒川温泉

Kurokawa Onsen

Operated by · 旅館 流憩園

曹
Bicarbonate
+ Chloride · Sulfate
Color
very faintly yellow-brown and clear
Taste
not recorded
Odor
faint hydrogen sulfide · faint metallic

Sodium Bicarbonate-Chloride-Sulfate spring

Hot source · 56°CHigh silica
Composition fingerprint1.1 g/kg dissolved · Hypotonic
Na⁺67
HCO₃⁻45
Cl⁻28
SO₄²⁻27
◀ CationsAnions ▶
Sodium Na⁺
salt's cation — pairs with chloride to make the water salty.
Bicarbonate HCO₃⁻
"soda" — softens skin, leaves it smooth.
Known good for
  • Smooth skindry, rough skin
  • Circulationtired legs
  • Aches & jointsstiff shoulders

A sodium-led bicarbonate spring with chloride and sulfate layered in — the classic jūsō-sen profile, here served hot at 56 °C. Neutral pH keeps it soft on the skin, placing it in the Japanese 'beauty-water' family. A generous 253 mg/kg of metasilicic acid leaves the skin noticeably smoother, and the water carries a faint yellow-brown tint at the source with light notes of hydrogen sulfide and iron.

Analyzed Feb 15, 2021·株式会社 三計テクノス

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1 review

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Sergey M
6 months ago

707. Ryokan Ryukeien, Tanohara Onsen, Kumamoto ★★ Visited for a day trip for 500 yen. Day trip hours are stated as 08:00 to 11:00, 13:00 to 15:00, and 18:00 to 20:00, but it's better to confirm before your visit. Located not far from Kurokawa. There are three private baths and one public men's bath, situated a bit apart from the main building. At the time of visit, only two private baths were available. 1. The closest private bath, an outdoor stone bath. Located in a low area. There is a wooden partition in the middle of the bath. The water is slightly cloudy, temperature around 42-43°C. 2. The farthest private bath, a semi-open stone bath. Encountered very dense yukemorebi (steam rising from hot water). The water is slightly cloudy, temperature around 43°C. A great place with a remote atmosphere, cool private baths at a very low price. Recommended for a visit. 29.12.2025

Onsen Oni

Last updated June 19, 2026