Karurusu Onsen
- Location
- Noboribetsu, Hokkaido, Japan
- Water type
- carbonated
- Temperature
- 38 °C
- pH
- 6.3
Water profile
Soothing — neither hot nor cold, perfect balance.
Loaded with major ions — the essential minerals (Ca, Mg).
Mineralised water — eases movement and joints.
Karurusu Onsen in Noboribetsu City, Hokkaido is one of the island's most historically distinguished thermal destinations, designated as a National Health Resort and recognized among the Top 100 Famous Hot Springs of Japan, reflecting the exceptional quality of its carbonated mineral waters. The spring's carbon dioxide-rich water produces an effervescent tingling sensation on the skin and is traditionally associated in Japanese and European thermal culture with a refreshing, invigorating bathing experience, qualities that earned it the designation Noboribetsu Karurusu Onsen after the famous Karlovy Vary spa tradition. This carbonated geothermal spring stands as a landmark within Hokkaido's rich onsen culture, combining recognition of its distinctive character with the cultural tradition of communal bathing that defines the finest Japanese thermal destinations.