100% hot spring water flowing directly
from the source (no added water or heating)
Uniquely-developed system for delivering bountiful spring water from the source Toshimaya has three springs on its premises that gush with bountiful spring water (Yakuo-no-Yu).
Water is not added or circulated: it simply flows directly from the springs so that all the baths at the Inn, including the large communal baths, private baths,
and open-air baths attached to guest rooms, are continuously filled with fresh spring water.
Shima means ‘40,000,’ and as the name Shima Onsen suggests, it is said to heal 40,000 kinds of ailments.
Come and take a leisurely dip.
Nine common baths and family baths
薬王の湯 Yakuo-no-Yu
Large communal open-air bath
Toshimaya’s open-air baths are set along the mountain stream so you can listen to the murmur of the stream while you soak.
At night, savor a high-quality experience under the brilliant starry sky.
麗峰 Reiho
Open-air bath
Forget your everyday worries and enjoy a moment of relaxation in the wide-open space overlooking the mountain stream.
Let the continuously flowing Yakuo-no-Yu springs warm your body to the core.
瑞雲 Zuiun
Open-air bath
There are two types of Zuiun baths: a warm bath and a deeper hot bath. The hot bath is deep enough that you can soak in the water up to your shoulders, and the water pressure on your body helps promote blood flow in your legs and relieve fatigue.
YAKUO-NO-YU HOURS
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MEN
3:00 PM-10:00 PM
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WOMAN
10:00 PM-9:30 AM
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MEN
10:00 PM-9:30 AM
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WOMAN
3:00 PM-10:00 PM
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Private baths
In approx. 40 m2 spacious large stone bath, natural sheet rock is exposed creating a cave-like expanse.
You can also book an open-air bath with a stunning view overlooking the Shimagawa River mountain stream at the same time.
Enjoy the luxury of a private hot spring flowing directly from the source with your family or partner.
Water for pouring on body / Spring water for drinking
The Shima Onsen springs have many effects, and its main effects are to alleviate gastrointestinal ailments and stimulate appetite by drinking the water.
About Yakuo-no-Yu
The Shima Onsen springs (Yakuo-no-Yu) are slightly salty springs (hot springs containing a small volume of salt).
This component is known to prolong the warming effects on the body.
This helps warm your body to the core.
| Name of spring source | Shima Onsen (Yakuo-no-Yu) |
|---|---|
| Spring qualities | Sodium-calcium chloride, sulfate springs (slightly alkaline hypotonic hot springs) Old name for spring quality: Gypsum salt springs |
| Perceptual test | Colorless and transparent |
| Spring temperature | Spring source 62°C |
| Yield | 200 liters per minute |
| Hot spring components | Positive ions: Potassium ions, sodium ions, calcium ions, magnesium ions, iron (II) ions, aluminum ions Negative ions: Fluoride ions, chlorine ions, sulfuric acid ions, hydrogen carbonate ions |
| Symptoms alleviated by bathing | Chronic digestive diseases (gastrointestinal diseases), neuralgia, muscle pain, joint pain, frozen shoulder, motor paralysis, poor circulation, recovery from fatigue, female disorders |
| General contraindications | Those who are afflicted with the following diseases and/or ailments are basically advised not to bathe in hot springs:
all acute diseases (febrile illnesses in particular), malignant tumors, serious heart diseases, respiratory failure, kidney failure, hemorrhagic diseases, severe anemia, other general diseases that are in progression. *If you are pregnant or have special concerns, please consult your doctor before using the hot springs. |
Toshimaya hot water distribution system
100% hot spring water flowing directly from the source
(no added water or heating)
Toshimaya has been running an Inn at Shima Onsen for many years and has three hot spring sources of its own that gush with bountiful spring water.
We have devised the best system for distributing that bountiful spring water.
This method uses a heat exchanger to control the water temperature.
We use heat exchangers developed by Hisaka Works on the hot spring sources that we have on premises (natural yield of 200 L/min at 60°C) to lower the temperature in the baths to around 42°C.
We use mountain water only to remove thermal energy.
The bathwater is not diluted by adding water.
We also do not use circulators or other such devices and instead allow water to flow naturally and unhindered from the source (the water gushes forth so much that it spills over)
, so that all the baths at the Inn, including the large communal baths, private baths, and open-air baths attached to guest rooms, are continuously filled with fresh spring water.
We feel that these artesian springs are gifts from the earth.
We are grateful for the springs that are the amniotic fluid of the earth and a natural blessing and we wish to cherish it always.