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Yosenkaku Iwamatsu Ryokan

鷹泉閣 岩松旅館たかいずみ閣 いわまつりょかん

Lodging
Tohoku·Miyagi

Day Use

No

Bathing & Water

Natural onsen water

Uses natural hot spring water

Outdoor BathYes

Open-air outdoor bath

Indoor BathYes

Enclosed indoor bathing area

Capabilities

Mixed BathingYes

Shared bathing area for all genders

For overnight guests only; a bathing garment (yuami-gi, 湯浴み着) or swimsuit is required; mixed bathing isn't available during women-only hours.

Policies & Services

TattooNo

Allows entry with visible tattoos

WashingYes

Shower, wash stations, soap and shampoo provided

ParkingYes

On-site or nearby parking available

Water treatment

Pure source water· 源泉かけ流し (gensen kakenagashi)
from Article 18 disclosure
  • Added water
    No
  • Reheated
    No
  • Recirculated
    No
  • Disinfected
    No
  • Bath additives
    No

新湯

Shin-yu

Operated by · 株式会社 鷹泉閣 岩松旅館

Sulfate
+ Chloride

Sodium-Calcium Chloride-Sulfate spring

Hot source · 52°C
Composition fingerprint1.9 g/kg dissolved · Hypotonic
Na⁺57
Ca²⁺40
Cl⁻61
SO₄²⁻25
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
  • Aches & jointsstiff shoulders
  • Circulationtired legs
  • Warmingcold sensitivity

A sodium-calcium spring led by sulfate with a chloride sub-type — moderately mineralized at about 1,869 mg/kg of dissolved solids. The water emerges hot at 52.3 °C and is weakly alkaline, soft on the skin, with the settled body of sulfate carrying a salt-tinged heat-retaining finish. Served as untreated source flow — no dilution, heating, recirculation, or disinfection.

Sampled at wellhead·Analyzed May 19, 2021·宮城県公害衛生検査センター·Cert no. 1219号

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Forest

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Onsen Oni

Last updated June 9, 2026