Ryusen no Yu
- Location
- Sosa, Chiba, Japan
- Water type
- thermal
- Temperature
- 40 °C
- pH
- 7.3
Water profile
Relaxing — deep, immediate muscle release.
Rich in trace elements — gentle on the skin.
Soft water — natural, classic buoyancy.
Ryusen no Yu—Dragon Spring Waters—takes its name from the ryusen, the dragon spring of Japanese mythology where the water deity in the form of a dragon dwells in the depths of the spring, the dragon's presence marking the spring as a place of exceptional mineral power and divine blessing accessible to those who bathe in its waters. Rising in Chiba Prefecture, this spring exists at the edge of the vast Kanto plain where the Boso Peninsula's geological heritage includes both the Pacific coastal formations of the eastern shore and the milder geological activity of the peninsula's interior highlands. The dragon spring name gives this Chiba thermal facility a mythological resonance that elevates the simple act of mineral bathing into a participation in the divine water tradition of Japan's oldest natural spring mythology.