Aburatsubo Onsen
- Location
- Miura, Kanagawa Prefecture, Japan
- Water type
- sodium chloride
- Temperature
- 41 °C
- pH
- 7.3
Water profile
Relaxing — deep, immediate muscle release.
Loaded with major ions — the essential minerals (Ca, Mg).
Dense, salty water — you float without effort.
Aburatsubo Onsen flows with iodine-rich thermal waters in Japan, providing the distinctive mineral bathing experience associated with iodine-bearing springs whose mineral content has long held a noted place in Japanese and international balneology, and whose particular sensory quality carries the chemical heritage of ancient marine geological formations from which iodine is typically derived. The name Aburatsubo, meaning oil pot or oil jar, suggests a spring whose water has an oily, viscous quality — perhaps from the high mineral content of the iodine-bearing water — or a historical association with the oil-like appearance of mineral-rich water in a natural pot-shaped rock formation, connecting the spring's name to the visual and tactile character of its distinctive mineral water. Aburatsubo Onsen's iodine mineral character and its evocative oily vessel name invite visitors to discover the more unusual and sensory-distinct expressions of Japan's diverse geothermal mineral heritage, where the ancient marine mineral iodine transforms the thermal bathing experience with a chemical signature that speaks to the deep geological history of the rock formations through which this spring's water travels.