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Shin-aoyamaso Inn

ビジネス新青山荘ビジネスしんあおやまそう

Lodging
Kyushu & Okinawa·Kumamoto

Day Use

Yes
13:00–17:00
¥400

Bathing & Water

Natural onsen water

Uses natural hot spring water

Indoor BathYes

Enclosed indoor bathing area

Policies & Services

WashingYes

Shower, wash stations, soap and shampoo provided

ParkingYes

On-site or nearby parking available

山鹿温泉

Yamaga Onsen

Operated by · 有限会社 青山殿

Simple
Color
colorless and clear
Taste
tasteless
Odor
faint hydrogen sulfide

Sodium Carbonate-Bicarbonate spring

pH 9.5AlkalineStrongly alkaline
Composition fingerprint0.2 g/kg dissolved · Hypotonic
Na⁺96
CO₃²⁻46
HCO₃⁻22
SO₄²⁻14
CationsAnions
Sodium Na⁺
salt's cation — pairs with chloride to make the water salty.
Carbonate CO₃²⁻
strongly alkaline; slippery feel.
Known good for
  • Smooth skindry, rough skin
  • Recoveryfatigue, stress

An alkaline simple thermal spring with a notably high pH of 9.5 — strong enough to give the unmistakable slippery, skin-smoothing feel of the Japanese beauty-water family. Dissolved solids are light at 170 mg/kg, but a faint hydrogen sulfide note and a fluoride content above the therapeutic-spring threshold give the water more character than the simple-thermal label suggests.

Sampled at wellhead·Analyzed Oct 18, 2016·株式会社 同仁グローカル·Cert no. 第K16104243号

Explore the water

Programs

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3.0

1 review

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Sergey M
1 year ago· edited

390. Shin-aoyamaso Inn, Yamaga Onsen, Kumamoto ★ I went for a higaeri for ¥300 (listed as 13:00 to 17:00). They stamp the Kyushu 88 Onsen rally. Inside there is a bath with clear water, the right slightly noticeable sulfurous onsen smell, and the water is soft. The temperature is 38. It is comfortable to breathe, and overall the bath feels cozy. 11.01.2025

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Last updated July 25, 2026