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Maenohara Onsen Sayano Yudokoro

前野原温泉 さやの湯処ぜんのはらおんせん さやのゆしょ

Bathing Complex
Kanto·Tokyo

Day Use

Yes
09:00–00:00
¥970

¥970 weekdays, ¥1,300 weekends

Bathing & Water

Natural onsen water

Uses natural hot spring water

Outdoor BathYes

Open-air outdoor bath

Indoor BathYes

Enclosed indoor bathing area

SaunaYes

Sauna room of any kind

Cold BathYes

Cold water plunge bath, typically used after sauna

Policies & Services

DiningYes

A restaurant or dining room open to visitors, not only meals for overnight guests

WashingYes

Shower, wash stations, soap and shampoo provided

TowelsYes

Towels to rent or borrow at the desk

Rest AreaYes

Relaxation space for after bathing

板橋前野温泉

Itabashi Maeno Onsen

Operated by · 株式会社 特殊金属エクセル

沃
Iodine-bearing
+ Chloride
Color
almost colorless and clear (slightly yellowish and turbid in the laboratory)
Taste
strongly salty with a metallic iron edge
Odor
accompanied by gas (mainly methane) escaping from the water

Sodium Chloride spring

pH 7.4NeutralStrong saltIodine-rich
Composition fingerprint22.1 g/kg dissolved · Hypertonic
Na⁺85
Cl⁻99
◀ 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
  • Cutsminor wounds
  • Recoveryfatigue, stress

A sodium chloride strong-salt spring carrying iodine — a dense, hypertonic water. At 22,140 mg/kg of dissolved solids it exceeds ocean salinity and leaves a thick mineral coating on the skin. Neutral in pH, it tastes strongly salty with a metallic iron edge, and as an iodine-bearing source it turns faintly yellow and cloudy on contact with air.

Sampled at wellhead·Analyzed Nov 10, 2015·一般社団法人 長野県薬剤師会·Cert no. 中No.27-63号

Explore the water

Highlights

Jet Bath

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4.0

1 review

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Sergey M
1 year ago· edited

295. Maenohara Onsen Sayano Yudokoro, Tokyo ★★ A super sento with onsen water, from the list of recommended places in Tokyo. Food, massage, a stone bath, massage chairs, a place to chill. There is a private bath, I did not use it, but it says that mixed-gender bathing is not allowed there. I had a massage, it was done well. The bath photos are from the internet, and they match. I could not find the sign at the onsen, so this is from the official site. 1. Outdoor area 1.1. Main round bath. The water is a clear dark brown, with lime. Temperature 40. Burnt smell. 1.2. Additional small bath, attached to the main one, apparently closer to the source. Cloudy white/dark brown. Temperature 40. Burnt smell. 1.3. Three barrels, with water like the main bath, a little clearer in color. 1.4. Reclining bath for 9 people. 1.5. Steam bath. 2. Indoor area. Breathing is fine, but there is a noticeable chlorine smell. 2.1. Main rectangular bath, clear water, temperature 39-40. 2.2. Various jets, 8 in total, clear water, temperature 40, strong chlorine smell. 2.3. Sauna. 2.4. Cold bath. A very cool outdoor bath, the water feels great, I relaxed well. It is also fairly convenient to get to from the northern part of the city. The indoor bath did not work for me because of the strong chlorine smell. Recommended for a visit. 16.11.2024

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Last updated October 13, 2026