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Koshikano Onsen is a group company
of Vision Corporation (TSE Prime Listed Company
[Securities Code: 9416])
Lowest price guarantee
Booking through our website is the best way to save.
Koshikano Onsen’s gentle, skin-smoothing beauty bath
A sodium-bicarbonate spring, commonly known as a "bath for beautiful skin."
This spring quality typically leaves you feeling refreshed after bathing, with a smooth and silky skin texture.
All rooms are equipped with a bath flowing directly from the source (*some rooms feature indoor baths only), allowing you to bathe whenever you like during your stay. Without worrying about other guests, you can fully enjoy a luxurious bathing experience in a private space just for you, your family, or friends.
The source of Koshikano Onsen is a natural free-flowing spring that gushes out from the earth by natural forces.
Nurtured by the earth over a long period, the hot spring emerges here on its own due to underground pressure.
Delivering the hot spring welling up within our grounds directly to your room.
Please enjoy this unique hot spring, found only in this region, as many times as you like without worrying about the time.
With a neutral spring quality that does not lean strongly toward acidity or alkalinity, you can enjoy a soft and gentle bathing experience. It is characterized by a refreshing feeling after bathing, often leaving the skin feeling smooth and silky. You can fully enjoy a comfortable bathing experience no matter how many times you soak during your stay.
| Item | Details |
|---|---|
| Spring type | Sodium bicarbonate spring |
| Classification | Hypotonic, neutral, high-temperature spring |
| Source temperature | 49.0°C |
| pH | 6.9–7.04 |
| Bicarbonate ions | 1,320 mg/kg |
| Sodium ions | 370 mg/kg |
| Metasilicic acid | 226.2 mg/kg |
| Total dissolved substances excluding gaseous components | 2,254 mg/kg |
| Total mineral content | 2,457 mg/kg |
Based on the hot spring analysis report, Koshikano Onsen is classified as a "Sodium-Bicarbonate Spring (Hypotonic, Neutral, High-Temperature Hot Spring)."
The thermal water contains 1,320 mg/kg of "bicarbonate ions."
A bicarbonate spring, formerly known as a "baking soda spring," is commonly cherished as a "bath for beautiful skin."
The components are said to soften sebum and old dead skin cells, typically providing a refreshing feeling after bathing and a smooth, silky skin texture.
Furthermore, with a pH of 6.9 to 7.04, it is a near-neutral spring that does not lean strongly toward either acidity or alkalinity.
You can enjoy its soft and pleasant feel upon entering the water.
Additionally, the hot spring analysis report indicates it contains 226.2 mg/kg of "metasilicic acid."
Metasilicic acid is a type of silicon compound found in hot springs.
It is a highly regarded component; among those particular about spring quality and ingredients, some choose their hot springs specifically based on the metasilicic acid content.
At Koshikano Onsen as well, we have guests who visit specifically for the metasilicic acid.
Along with the refreshing after-bath feeling unique to bicarbonate springs, please take your time to enjoy the soft texture of Koshikano Onsen in the comfort of your room.