Red bridge and Sekizenkan main building
Photo information

Kanto · Onsen area

Shima Onsen

しまおんせん · 四万温泉

Gunma · 吾妻郡中之条町

OpenNational Health Resort Onsen100 Onsen to Know Japan — No. 26
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Official classification

Spring type (therapeutic classes)

Official spring-type name (as recorded)Sodium–calcium chloride and sulfate hot spring (as given by the Shima Onsen Association and Sekizenkan)

Source temperature
43–82°C
pH
7.7
Flow rate
3,500 L/min
Radon
Unconfirmed

Appearance & feel

Water colour · Feel

Clear

Colour and feel are listed only where a source states them. They vary by day and by bath.

What makes it special

A wooden bath-inn built in 1691 still takes guests, and you can drink the water at fountains by the river. A clear spring named for 'curing forty thousand ills'.
Why?

Sekizenkan describes its main building (1691) as Japan's oldest surviving wooden bath-inn and a Gunma Prefecture Important Cultural Property. The Shima Onsen Association traces the name to 'a sacred spring that heals forty thousand ills', and the Nakanojo tourism office lists the Shio-no-yu and Yuzuriha drinking fountains.[1][2][4]

Facilities in this area

Facilities come from the register (Wikipedia, OpenStreetMap, official sites). Those marked "natural spring unconfirmed" are listed on the basis of their name only.

Ryokan (inn) · Open

Sekizenkan

Day-use bathing
Yes
Fee
¥1,500checked 2026-10-09
Hours
10:00–17:30checked 2026-10-09
Baths3
TypeGenderSourceBath temperatureFree-flowingAdded waterHeatedRecirculatedDisinfected
Indoor bathSeparateUnconfirmedUnconfirmedUnconfirmed[5]Unconfirmed[5]Unconfirmed[5]Unconfirmed[5]Unconfirmed[5]
Open-air bathSeparateUnconfirmedUnconfirmedUnconfirmed[5]Unconfirmed[5]Unconfirmed[5]Unconfirmed[5]Unconfirmed[5]
Private bathUnconfirmedUnconfirmedUnconfirmedUnconfirmed[5]Unconfirmed[5]Unconfirmed[5]Unconfirmed[5]Unconfirmed[5]
Public bathhouse · Open

Kawara-no-yu

Day-use bathing
Yes
Fee
Unconfirmedno check date
Hours
9:00–15:00checked 2026-10-09
Baths1
TypeGenderSourceBath temperatureFree-flowingAdded waterHeatedRecirculatedDisinfected
Indoor bathSeparateUnconfirmedUnconfirmedUnconfirmed[7]Unconfirmed[7]Unconfirmed[7]Unconfirmed[7]Unconfirmed[7]
Day-use bath · Open

Shima Seiryu-no-yu

Day-use bathing
Yes
Fee
¥600checked 2026-10-09
Hours
10:00–20:00(短縮営業中は10:00–17:00、受付16:30まで)checked 2026-10-09
Baths2
TypeGenderSourceBath temperatureFree-flowingAdded waterHeatedRecirculatedDisinfected
Open-air bathSeparateUnconfirmedUnconfirmedUnconfirmed[10]Unconfirmed[10]Unconfirmed[10]Unconfirmed[10]Unconfirmed[10]
Indoor bathSeparateUnconfirmedUnconfirmedUnconfirmed[10]Unconfirmed[10]Unconfirmed[10]Unconfirmed[10]Unconfirmed[10]

Getting there

Reachable by public transport

From Nakanojo Station on the JR Agatsuma Line, Kan-etsu Kotsu bus about 40 minutes (1,150 yen) to the terminus 'Shima Onsen'; Sekizenkan is a 2-minute walk. The 'Shima Onsen-go' express bus from Tokyo Station (Yaesu south exit) takes about 3.5 hours, departing 8:50 year-round with extra winter runs.

Getting there
Nakanojo Station · 40
Through the year
December–March: winter tyres or chains required (per Sekizenkan).
Checked
2026-10-09

About the water

Shima's water is a sodium–calcium chloride and sulfate spring: it carries salt and gypsum minerals yet looks clear and smells of little. The association counts 42 sources. Wikipedia gives source temperatures of 43–82 °C, an average pH of 7.7 (2001) and a flow of about 3,500 litres a minute. Historically people came here after a course of Kusatsu's harsh acid water to let their skin recover, which is why Shima was called 'Kusatsu's finishing bath'. Sekizenkan's notice lists rheumatic complaints, musculoskeletal problems and wounds for bathing, and chronic digestive complaints and constipation for drinking. We make no medical claims.

Indications (as posted on the analysis)

Posted at Sekizenkan: bathing for rheumatic complaints, musculoskeletal disorders, wounds, chronic conditions and keratosis; drinking for chronic digestive complaints, constipation and chronic liver/biliary complaints

Indications are an official statement based on the water analysis, not a guarantee of treatment. They are kept separate from opinions.

SourceSource temperaturepHRadonChecked
Shima Onsen (42 sources in total)UnconfirmedUnconfirmedUnconfirmedno check date

Three things not to miss

Red bridge and Sekizenkan main building
Photo information
01

Sekizenkan's main building and the Genroku-no-yu

Arayu district, across the Keiun Bridge The 1691 main building is a Gunma Prefecture Important Cultural Property. The Genroku-no-yu bathhouse of 1930, Western in style with arched windows, holds five stone tubs in a row. Day bathing 1,500 yen with towel, 10:00–17:30 (last entry 17:00).

Edo, early-Showa and modern buildings are linked by tunnels and corridors, so you can walk through 300 years of inn history under one roof.[1][5][6]

Shio-no-yu drinking fountain pavilion
Photo information
02

Drinking fountains (Shio-no-yu, Yuzuriha)

Around the spa village Small pavilions where you drink the spring water. Sekizenkan's notice lists chronic digestive complaints and constipation among the indications for drinking.

Shima has long been called one of Japan's three great springs for the stomach. Drinking the water continues that tradition as an everyday habit.[4][5][2]

Stone building of Kawara-no-yu
Photo information
03

Free public baths: Kawara-no-yu and Gomuso-no-yu

Kawara-no-yu at the meeting of the Shima and Arayu rivers; Gomuso-no-yu in the Hinatami district Both open 9:00–15:00 daily (per the town tourism office). Kawara-no-yu is a cave-like stone bath; Gomuso-no-yu stands on the spring held to be Shima's birthplace and was rebuilt as a wooden bathhouse in 2006.

No fee is posted; these are baths kept by local people. Leave a donation and follow the house rules.[7][8]

The story

Forty thousand ills

Shima lies on the upper Shima River, which runs south out of the Mikuni range. The name is said to come from 'a sacred spring that heals forty thousand (shi-man) ills'. In legend the warrior Usui Sadamitsu, chanting sutras through the night here, dreamed of a child spirit who granted him the spring; the spot is Gomuso-no-yu in Hinatami. The first inn opened in 1563. In 1954 Shima, with Sukayu in Aomori and Nikko-Yumoto in Tochigi, became one of the first three National Health Resorts.[8][9][1]

Three centuries of Sekizenkan

Sekizenkan built its bathhouse and lodgings on this spot in 1691 and opened as an inn in 1694 under its founder Seki Zenbei. Locals called it 'Sekizen', and a Meiji-era owner matched that nickname to a line from the I Ching, 'the house that accumulates good deeds (sekizen) has blessings to spare'. The main building is the oldest surviving wooden bath-inn in Japan and a prefectural Important Cultural Property. The Genroku-no-yu of 1930 is a Western-style bathhouse with arched windows and five stone tubs; the Sanso wing of 1936 is a nationally registered cultural property. The storyteller San'yutei Encho and the poet Yanagiwara Byakuren were among its guests.[1][5][12]

Kusatsu's finishing bath

Shima's water is a sodium–calcium chloride and sulfate spring, clear to look at, from 42 sources according to the association. People traditionally came here after a course of bathing in Kusatsu's harsh acid water to let their skin recover, hence the nickname 'Kusatsu's finishing bath'. The habit of drinking the water survives at fountains such as Shio-no-yu and Yuzuriha. It has long been reputed good for the stomach and called one of Japan's three great springs for digestive complaints; we leave the medical claims to the notices.[2][9][4]

Getting there and around

The bus from Nakanojo Station takes about 40 minutes and costs 1,150 yen; Sekizenkan is two minutes from the terminus. There is also a direct express bus from Tokyo Station. The village is long and thin along the river, walkable from Gomuso-no-yu in Hinatami up to Lake Okushima. The free public baths open 9:00–15:00. Winter tyres are essential if you drive.[3][7][8][11]

Going solo

Easy for solo travellersUnconfirmed
Weekend / peak restrictionsUnconfirmed
Where to eat dinnerEateries and cafes in the village; the inn's 'Sekizen-ya' serves 11:00–15:00 (closed Fridays)
Private bathYes

checked 2026-10-09

Through the year

Recommended months

Months open

JanFebMarAprMayJunJulAugSepOctNovDec

"Recommended" and "open" are recorded separately. Check the season for seasonal springs.

Apr · May — Snowmelt makes Lake Okushima its deepest 'Shima Blue'; best on a clear morning

Oct · Nov — Autumn colour mid-October to early November

Dec · Jan · Feb · Mar — Snow; winter tyres essential. Extra express-bus runs in winter

Food, culture & experiences

Available / bookable

Lake Okushima (Shima Blue)

The reservoir behind Shima River Dam; a 4 km loop road, canoeing available. Bluest during the April–May snowmelt[11]

At the far end of the valley
Available / bookable

Gomuso-no-yu and the Hinatami Yakushi hall

Where, in legend, a child spirit appeared in the warrior Usui Sadamitsu's dream and granted 'a spring to heal forty thousand ills'[8]

Hinatami district at the north end

Editors' guide

Arrive at midday for Sekizenkan's Genroku-no-yu (1,500 yen) and a look round the buildings. Take a sip at the Shio-no-yu fountain, then get to Kawara-no-yu before it closes at 15:00. Next morning, if it is clear, go up to see Lake Okushima; April–May gives the deepest blue.

The "editors' guide" above is written by the editors from sources; it is not a visitor's opinion.

Visitor reviews

No reviews yet. While the review platform is being prepared, we do not display fictional reviews or ratings.

Review posting is in preparation, with visit date, facility, comments on water, scenery and access, photos, language and reporting.

Overview

Shima Onsen is a name of Japanese town and hot springs - onsen, the part of Nakanojō city in the Gunma Prefecture.

This overview is based on the lead section of the English Wikipedia article (CC BY-SA 4.0). View original page

Unconfirmed & notes

  • Source temperature, pH and flow are Wikipedia figures, not confirmed on official notices; flow-through/added-water notices unconfirmed
  • Whether Kawara-no-yu and Gomuso-no-yu are free or donation-based is not stated on the town tourism pages
  • Sekizenkan's solo-stay terms and closing days, and bus frequency from Nakanojo, unconfirmed

Sources

  1. 四万温泉 積善館 公式サイト積善館 · 2026-10-09
  2. 四万温泉協会 四万温泉について四万温泉協会 · 2026-10-09
  3. 積善館 アクセス積善館 · 2026-10-09
  4. 中之条町観光協会 四万温泉中之条町観光協会 · 2026-10-09
  5. 積善館 温泉積善館 · 2026-10-09
  6. 積善館 日帰り入浴・ランチ積善館 · 2026-10-09
  7. 河原の湯(中之条町観光協会)中之条町観光協会 · 2026-10-09
  8. 御夢想の湯(中之条町観光協会)中之条町観光協会 · 2026-10-09
  9. 四万温泉 - WikipediaWikipedia · 2026-10-09
  10. 四万清流の湯(中之条町観光協会)中之条町観光協会 · 2026-10-09
  11. 奥四万湖(中之条町観光協会)中之条町観光協会 · 2026-10-09
  12. 積善館 歴史積善館 · 2026-10-09

Register sources

Data status

Name & locationPublishedCoordinatesPublishedSpring typePublishedPhotosPublishedFacilitiesPublishedVisiting info (dated)PublishedEditorial articlePublished

Updated 2026-10-09

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