Aze Onsen
Illustration photo — not a verified picture of this exact spot.
- Location
- Uonuma / Niigata, Japon, Japan
- Water type
- thermal
- pH
- 7.3
Water profile
Rich in trace elements — gentle on the skin.
Soft water — natural, classic buoyancy.
Aze Onsen is a thermal spring in Minamiuonuma City, Niigata Prefecture, forming one of four springs in the Muikamachi Onsenkyo cluster alongside Muikamachi Onsen, Uenohara Kogen Onsen, and Isazawa Onsen—a grouping honored with Japan's National Health Resort designation. Nestled in the snow country of Uonuma, where heavy winter snowfall nourishes the surrounding landscape, Aze embodies the quieter, local character of the cluster rather than its more famous neighbors. Visitors seeking an authentic tojikyaku (therapeutic-stay) experience find in Aze the unhurried pace and mineral waters that define the healing traditions of Niigata's interior valleys.