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Miyama Sanso

山みず木別邸 深山山荘やまみずきべってい ふかやまさんそう

Lodging
Kyushu & Okinawa·Kumamoto

Day Use

Yes
10:00–15:00
¥800

Bathing & Water

Natural onsen water

Uses natural hot spring water

Outdoor BathYes

Open-air outdoor bath

Indoor BathYes

Enclosed indoor bathing area

Capabilities

Room OnsenYes

Private onsen bath in guest rooms, for overnight guests only

山みず木本館 深山山荘

Yamamizuki Honkan Miyama Sanso Spring
Sulfur
Color
colorless and transparent
Taste
not recorded
Odor
not recorded

Sodium-Calcium Sulfate spring

Hot source · 51°CHigh silica
Composition fingerprint0.5 g/kg dissolved · Hypotonic
Na⁺45
Ca²⁺35
SO₄²⁻78
F⁻19
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

A weakly alkaline, hot simple-sulfur spring emerging at 50.5 °C. At pH 8.79 it has the slippery, soft feel of Japan's beauty-water family, and a fairly generous 99.3 mg/kg of metasilicic acid leaves the skin noticeably smooth. The water is lightly mineralized overall, so it sits gently on the body.

Sampled at wellhead·Analyzed Aug 23, 2018·ニチボー九州株式会社·Cert no. X18-00702

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4.0

1 review

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Sergey M
1 year ago· edited

417. Miyama Sanso, Kurokawa Onsen ★★ I visited for a day trip costing 800 yen. The day trip is available from 10:00 to 15:00. It is located in an area with thatched-roof cottages, away from the center of Kurokawa, near Yamamizuki. Closer to the entrance, I was greeted by a small snowman. Although the onsen is marked on the Kurokawa tegata (stamp rally map), it is not included in the tegata itself. However, you can ask them to put a "secret" stamp on the back of the tegata for fun (this stamp will not count towards the achievement). When I asked for a water composition sheet, they literally gave me a photocopy from a folder and said I could take it with me. The outdoor bath is made of stone with an apocalyptic winter view of bare trees. The water is clear but slightly cloudy, with white lime fragments. The temperature is 43°C. The indoor bath has clear, slightly cloudy water with white lime fragments. The temperature is 42.5°C. It is comfortable to breathe inside. A good rotenburo (outdoor bath) on its own, and combined with Yamamizuki, it is an excellent option for a visit. 14.01.2025

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Last updated June 19, 2026