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Suikoen

翠紅苑みどりくれないえん

Lodging
Chubu·Shizuoka

Day Use

Yes
11:30–20:00

Bathing & Water

Natural onsen water

Uses natural hot spring water

Outdoor BathYes

Open-air outdoor bath

Indoor BathYes

Enclosed indoor bathing area

SaunaNo

Sauna room of any kind

Cold BathNo

Cold water plunge bath, typically used after sauna

Bathing Arrangements

Mixed BathingNo

Shared bathing area for all genders

Policies & Services

DiningYes

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

混合泉

Sumatakyo Onsen Blended Source

Operated by · 川根本町 観光交流課

Mixed source

黄
Sulfur
Color
almost colorless and transparent
Taste
faintly of hydrogen sulfide
Odor
faint hydrogen sulfide, with gas evolution

Sodium Bicarbonate spring

pH 9.1AlkalineHot source · 43°CSulfur-richTop-decile alkaline
Composition fingerprint0.7 g/kg dissolved · Hypotonic
Na⁺98
HCO₃⁻92
◀ CationsAnions ▶
Sodium Na⁺
salt's cation — pairs with chloride to make the water salty.
Bicarbonate HCO₃⁻
"soda" — softens skin, leaves it smooth.
Known good for
  • Skin conditionsatopic skin, eczema
  • Circulationtired legs
  • Aches & jointsstiff shoulders
  • Sensitive-skin cautionbroken or dry skin

A simple sulfur spring on the alkaline side (pH 9.1), carrying the faint rotten-egg note of hydrogen sulfide with visible gas evolution at the source. The alkalinity gives it the slippery, beauty-water feel of the classic Japanese 'bijin-no-yu' family, soft on the skin. It is served as a blended source pooled at a mixing manifold, and with dissolved solids of just 0.714 g/kg it stays lightly mineralized and gentle on the body.

Sampled at mixing tank·Analyzed Oct 11, 2023·一般財団法人 静岡県生活科学検査センター·Cert no. 第 M23017 号

Explore the water

Views

Forest

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AR
Aleksei Rozin
1 year ago

Stayed overnight here at Suikoen. The second bath set from the male/female rotation is generally similar to the first, except the water temperatures seem swapped — the indoor bath is cooler, around 39, while the outdoor one is hotter. The rotenburo in this set is noticeably smaller too. Photos from Google and the website generally match. The room was great, spacious. The window view partly overlooks the parking lot, but you can also see the surrounding mountains, so that counts as a plus. Photos from Google as well, but everything was pretty much the same. Food-wise, nothing special besides the tea shabu-shabu — nothing else particularly interesting. I saw that the local cuisine includes tsukudani made from locusts, but thankfully (or unfortunately) they didn't have it here. But of course, staying here was worth it at least for Yume no Tsuribashi — the most epic of the local suspension bridges. It's about a 20-minute walk from the onsen, and the views are breathtaking. Yuru Camp fans will also be pleased.

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SM
Sergey M
1 year ago· edited

263. Suikoen, Sumatakyo Onsen ★ We visited for a day trip, listed from 11:30 to 20:00. It is included in the Yuragi stamp booklet, now 1 of the 3 remaining on the booklet. They stamp the Shizuoka 60 onsen 24/25 rally. The place looks like one of the most solid ryokan in the settlement. The indoor bath has clear water, with a very slight soapy feel. The temperature is 43. Breathing is fine. The outdoor bath is set in stone. Even though there is a large fence, there is still a pleasant view of the forest and the echoes of the Seiwa period. The online photo of the outdoor bath matches. The water is clear, with a very slight soapy feel, and the temperature is 39. It is worth stopping by for a day trip if you are nearby. 11.11.2024

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Last updated October 13, 2026