Kakushin Onsen
Aga, Niigata, Japan
- Location
- Aga, Niigata, Japan
- Water type
- thermal
- Temperature
- 38 °C
- pH
- 7.3
Water profile
Thermicity
Neutral
LowHigh
Soothing — neither hot nor cold, perfect balance.
Mineralisation
Balancing
LowHigh
Rich in trace elements — gentle on the skin.
Buoyancy
Standard buoyancy
LowHigh
Soft water — natural, classic buoyancy.
BicarbonatesCalcium
Kakushin Onsen is a simple hot spring in Japan, its name—meaning renewal or core—suggesting a place of return and restoration at the heart of the Japanese bathing tradition. Simple alkaline springs like Kakushin are renowned for their skin-softening bijin no yu (beauty water) quality, as the mildly alkaline pH gently removes surface oils and leaves the skin refreshed. This approachable spring draws bathers who seek the uncomplicated pleasures of hot mineral immersion within a traditional Japanese setting.
Insider tip — Kakushin Onsen in the Niigata highlands lies in the Aga region along the Agano river, in a landscape of forested mountains and deep snow near the Fukushima border. The mild springs serve a river-valley landscape in the Echigo mountains, where the Agano river — one of Japan's great rivers — flows through dramatic gorges, and where the onsen tradition offered warmth and respite in one of the snowiest and most beautifully forested regions of the Sea of Japan side of Honshu.
Nearby
Frequently asked questions
How hot is the water?
The water is neutral here, around 38 °C — a perfect balance, neither too hot nor too cold.
What type of water is found here?
This spot features thermal water.
What is the best season to visit?
The most favourable period for this spot is: Toute l'année.