Shima Yamaguchikan

四万やまぐち館しまやまぐちかん

Lodging

Shima Onsen

Kanto·Gunma

0279-64-2011 yamaguchikan.co.jp

Contact form

Day Use

Yes

12:00–15:00

Last admission at 13:30

¥1,000

90 min. Adults ¥1,000, children ¥700, infants ¥500

Bathing & Water

Natural onsen water

Uses natural hot spring water

Outdoor BathYes

Open-air outdoor bath

Indoor BathYes

Enclosed indoor bathing area

Capabilities

Private BathNo

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

Room OnsenYes

Private onsen bath in guest rooms, for overnight guests only

Mixed BathingNo

Shared bathing area for all genders

Policies & Services

DiningYes

Restaurant or dining open to visitors (not just hotel meal plans)

WashingYes

Shower, wash stations, soap and shampoo provided

TowelsYes

Towels available to rent or borrow

Rest AreaYes

Relaxation space for after bathing

ParkingYes

On-site or nearby parking available

Water treatment

Treated and recirculated

from Article 18 disclosure

Added water
Yes
Reheated
No
Recirculated
No
Disinfected
No
Bath additives
No

神告の湯、つばめの湯、第三の湯、菩薩の湯、かかし橋下の湯、滝の湯の混合泉（四万温泉）

Shima Onsen — blend of six sources (Shinkoku-no-yu, Tsubame-no-yu, Daisan-no-yu, Bosatsu-no-yu, Kakashibashishita-no-yu, Taki-no-yu)

Operated by · 株式会社四万温泉山口館

Mixed source

塩

Chloride

+ Sulfate

Color: colorless and transparent
Taste: not recorded
Odor: not recorded

Sodium-Calcium Chloride-Sulfate spring

pH 7.6Weakly alkalineHot source · 52°CHigh silica

Composition fingerprint1.5 g/kg dissolved · Hypotonic

Na⁺59

Ca²⁺38

Cl⁻65

SO₄²⁻29

◀ CationsAnions ▶

Sodium Na⁺: salt's cation — pairs with chloride to make the water salty.
Chloride Cl⁻: table-salt anion — coats the skin and holds heat in.

Known good for

Warmingcold sensitivity
Circulationtired legs
Aches & jointsstiff shoulders

A blend of six Shima Onsen sources — Shinkoku-no-yu, Tsubame-no-yu, Daisan-no-yu, Bosatsu-no-yu, Kakashibashishita-no-yu and Taki-no-yu — gathered in an underground storage tank before it reaches the baths. It is a sodium-calcium chloride-sulfate water: weakly alkaline and soft on the skin, moderately mineralized at 1,490 mg/kg dissolved solids, with the salty, heat-retaining character of a chloride spring and sulfate adding quiet body. Metasilicic acid runs to 105 mg/kg, enough to leave the thin silica film that places this water in Japan's beauty-water family. The sample was taken at a bath inlet rather than the wellhead; the posted disclosure states the tubs are neither recirculated nor chlorinated — the water is drained and refilled daily — with plain water added only when the bath runs too hot.

Sampled at bath inlet·Analyzed Oct 15, 2014·一般社団法人群馬県薬剤師会（環境衛生試験センター）·Cert no. 群馬薬第2号

Explore the water

Views

River

About

The open-air baths here sit right on the Shimagawa river, and the view is the main draw. There are two rotenburo (露天風呂) and one indoor bath, all running on kakenagashi (free-flowing spring water, not recirculated). Some upper-floor rooms come with a semi-outdoor in-room onsen. Day-use bathing is also available on a 90-minute slot basis.

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5.0

3 reviews

from 1 reviewer

Sergey M

6 months ago· edited

796. Shima Yamaguchikan, Shima Onsen, Gunma (pt.1) ★★★ I booked a duplicate reservation. There is a bath swap between men and women. There is a day-use option for ¥1 000 from 12:00 to 15:00, but with day-use access is only to one of the rotenburo. The cost of booking a simple single room without meals in the off-season was very cheap for this place. There was little interaction with the service, but everything was decent, and there was an announcement about a performance in the evening. A great selection of different cool baths. A top place, ideally you should stay overnight or use a duplicate reservation, because day-use gives too limited an experience of the facility's full potential. 13.01.2026 14.01.2026

Sergey M

6 months ago· edited

796. Shima Yamaguchikan, Shima Onsen, Gunma (pt.2) ★★★ 1. First set of baths, alternating between men and women. 1.1. Outdoor area. View of the river and trees through the fence. 1.1.1. Stone bath. The water is clear with a greenish tint, temperature 39. 1.1.2. Rectangular bath. The water is clear, temperature 41. 1.2. Indoor bath. The water is clear with a greenish tint, temperature 41. It is easy to breathe inside. 2. Separate indoor bath with a Buddha. A place with atmosphere. It is okay to breathe inside. 2.1. Bath with clear water, temperature 42. 2.2. Bath with clear water, temperature 45.5. 13.01.2026 14.01.2026

Sergey M

6 months ago· edited

796. Shima Yamaguchikan, Shima Onsen, Gunma (pt.3) ★★★ 3. Second set of baths, alternating for men and women. 3.1. Outdoor bath. Great view of the trees and the river. In the evening, soft lighting is turned on on the opposite bank, which makes the view from the bath even better. The bath itself is divided into two sections, and at the far end there is a huge stone with characters carved on it, and to the side there is a shrine, with a staircase that starts right from the rotenburo. Very strong atmosphere. The water is clear, temperature 40-42. 3.2. Indoor bath. The water is clear, temperature 41. It is comfortable to breathe inside. 13.01.2026 14.01.2026

Slava

2 years ago

A beautiful ryokan with an excellent rotenburo right by the river without solid fences. The free public baths and Sekizenkan don't have rotenburo, so this one made up for it.