Onsen OniOnsen Oni

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
03-5916-3826sayanoyudokoro.co.jp

Day Use

Yes

Bathing & Water

Outdoor BathYes

Open-air outdoor bath

OnsenYes

Uses natural hot spring water

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

板橋前野温泉

Itabashi Maeno Onsen

Operated by · 株式会社 特殊金属エクセル

Sampled at wellhead
沃
Iodine-bearing
+ Chloride
Classification

Sodium Chloride spring

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.

pH
7.40
Neutral
Source temperature
36.9°C
Warm
Tonicity
22.14g/kg
Hypertonic
Free CO₂
13mg/kg
Low
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
Highlights
  • Strong salt
  • Iodine-rich

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

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SM
Sergey M
1 year ago

295. Maenohara Onsen Sayano Yudokoro, Tokyo Super sento with onsen water, one of the recommended places in Tokyo. Restaurant, massage, stone bath, massage chairs, chill-out zone. There's a private bath (didn't take it), but with a note that mixed-gender groups aren't allowed. I got a massage — well done. Bath photos from the internet, accurate. Couldn't find the composition sign inside the onsen, so took it from the official website. 1. Outdoor zone. 1.1. Main round bath. Water is clear dark-brown with some limescite deposits. Temperature 40. Burnt smell. 1.2. Smaller additional bath, adjacent to the main one (seems to be closer to the source). Cloudy white/dark brown. Temperature 40. Burnt smell. 1.3. Three barrels with water like the main bath, slightly clearer in color. 1.4. Lying bath for 9 people. 1.5. Steam bath. 2. Indoor zone. Comfortable to breathe, but a noticeable chlorine smell. 2.1. Main rectangular bath, clear water, temperature 39-40. 2.2. Various jets, 8 units, clear water, temperature 40, strong chlorine smell. 2.3. Sauna. 2.4. Cold bath. Really great outdoor bath, the water is lovely, felt very relaxed. Also fairly convenient to get to from the northern part of the city. The indoor bath wasn't for me because of the strong chlorine smell. Recommended for a visit.