Fujiya

ふじ屋

Lodging

Kurokawa Onsen

Kyushu & Okinawa·Kumamoto

+81 967-48-8117 ryokan-fujiya.jp

Day Use

Bathing & Water

Natural onsen water

Uses natural hot spring water

Outdoor BathNo

Open-air outdoor bath

Indoor BathYes

Enclosed indoor bathing area

SaunaYes

Dry heat sauna room

Capabilities

Private BathYes

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

黒川温泉（ふじ屋源泉）

Kurokawa Onsen (Fujiya Spring)

Operated by · 有限会社富士屋

酸

Acidic

+ Iron-bearing · Sulfate

Color: colorless and clear
Taste: strongly astringent
Odor: moderate metallic iron odor

Sodium Sulfate-Chloride spring

pH 2.8AcidicHot source · 56°CUltra-acidicIron-richHigh silica

Composition fingerprint0.8 g/kg dissolved · Hypotonic

Na⁺37

H⁺17

Fe²⁺15

SO₄²⁻79

Cl⁻20

◀ 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 ultra-acidic, iron-bearing simple thermal spring of the sulfate sub-type — pH 2.8 sharp enough to sting slightly on contact, with a strong astringent bite and an unmistakable metallic iron note. Total iron of 48 mg/kg oxidizes to reddish-brown on air contact, and 150 mg/kg of metasilicic acid leaves a thin silica film for noticeably smoother skin. Emerges from the well at a hot 56 C.

Sampled at wellhead·Analyzed Oct 18, 2016·株式会社同仁グローカル·Cert no. 第K16104240号

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3.0

3 reviews

from 1 reviewer

Sergey M

7 months ago

705. Fujiya, Kurokawa Onsen (pt.2) ★ About the onsens: 1. Indoor public bath zone. Bearable to breathe inside, but very high humidity. Completely steamy both morning and evening. The indoor bath is split into two sections by a divider, clear water. Temperature — closer to the window 44°C, farther from the window 43.5°C. 2. There's a sauna through a small exit from the indoor public bath zone and a passage on a balcony. The balcony is fenced, but the fence is below head height and you can see people walking on the other bank. 3. First private indoor bath. Clear water, around 41.5-42°C. Good air inside — there's a window. 4. Second private indoor bath. Clear water, around 41.5-42°C. Good air inside — there's a window, it was open. 28.12.2025 29.12.2025

Sergey M

7 months ago

705. Fujiya, Kurokawa Onsen (pt.1) ★ Stayed overnight. No day-use available. Got food and a simple single room (sink and toilet in the room). They serve kaiseki dinner — everything was solid. Very warm welcome, great service level, Japanese staff, limited English. The ryokan is right by the main bridge in Kurokawa. Inside it's authentically atmospheric, albeit a bit simple — very cozy to stay at. The ryokan has public baths and two private baths on a first-come-first-served basis. Between 15:00-21:30 and 07:00-10:00 you can use the rotenburo of the partner ryokan Oyado Noshiyu, a 5-minute walk away (separate review for that one). A nice ryokan, good service, excellent location, but no rotenburo of its own, which makes it very hard to consider when choosing a ryokan in Kurokawa given the overall high level of establishments in the village and the number of options available. 28.12.2025 29.12.2025