Matsushiro Onsen
- Location
- Nagano City (Matsushiro), Nagano (Chubu), Japan
- Water type
- silica
- Temperature
- 40 °C
- pH
- 7.2
Water profile
Relaxing — deep, immediate muscle release.
Rich in trace elements — gentle on the skin.
Soft water — natural, classic buoyancy.
Matsushiro Onsen is located in the Matsushiro district of Nagano City, Nagano Prefecture, in the historic castle town that served as the seat of the powerful Sanada clan — warriors celebrated throughout Japanese popular culture for their resistance at the Battle of Osaka and whose red armor and distinctive deer antler helmet became iconic symbols of samurai spirit during the Sengoku period of civil wars. The siliceous thermal waters here flow through a district whose exceptional feudal heritage includes the Matsushiro Castle ruins, the Sanada Treasure Museum, and the extraordinary Zozan Underground Imperial Headquarters — a vast wartime tunnel complex carved into the Matsushiro hills as a planned relocation site for the Japanese imperial family during World War II. Bathing at Matsushiro Onsen in this samurai castle town of exceptional historical significance provides an atmospheric wellness experience uniquely layered with the proud martial heritage of the Sanada and the complex wartime history preserved in these Nagano highlands.