Nassa Onsen
- Location
- Nachikatsuura, Wakayama, Japan
- Water type
- bicarbonate
- Temperature
- 40 °C
- pH
- 8
Water profile
Relaxing — deep, immediate muscle release.
Loaded with major ions — the essential minerals (Ca, Mg).
Soft water — natural, classic buoyancy.
Nassa Onsen is a hot spring in Wakayama Prefecture on the Kii Peninsula, in the forested mountain zone of this historically sacred and naturally spectacular southernmost part of the Kinki region whose UNESCO World Heritage pilgrimage landscapes of Koyasan, Kumano, and Yoshino attract visitors from across Japan and the world. Wakayama Prefecture is home to the headquarters of Shingon esoteric Buddhism at the mountaintop monastery complex of Koyasan, the Kumano Sanzan grand shrine complex and its ancient pilgrimage routes, and the biologically diverse coastal zone of the Kinokawa estuary and the Shirahama and Tanabe coastline. The bicarbonate mineral waters of Nassa Onsen provide gentle and skin-softening therapeutic bathing to pilgrims and visitors traversing the sacred mountain landscapes of Wakayama Prefecture, offering a place of physical renewal within one of Japan's most spiritually significant and naturally extraordinary peninsulas.