Loaded with major ions — the essential minerals (Ca, Mg).
Buoyancy
Standard buoyancy
LowHigh
Soft water — natural, classic buoyancy.
BicarbonatesSodiumCalcium
Ohama Onsen in Matsue, Shimane prefecture, draws bicarbonate-rich thermal waters in Japan's 'water city' — a castle town surrounded by Lake Shinji, Lake Nakaumi, and the Shinjiko-Nakaumi lagoon system, a UNESCO Ramsar wetland famous for sunset silhouettes over water and the finest shijimi clam miso soup in Japan. Matsue's literary heritage — the great Lafcadio Hearn lived here in the 1890s and documented Shimane's folklore — gives the onsen culture a romantic cultural dimension of ghost stories, Shinto mythology, and traditional townscape charm. The nearby Matsue Castle, one of Japan's only surviving original tenshu keep towers, and the Adachi Museum of Art and Karakoro Art Studio surround the onsen with exceptional Shimane cultural offerings.
Insider tip — Ohama Onsen lies just west of Matsue, the castle town on the shores of Lake Shinji, offering bicarbonate waters that suit extended soaking after a day exploring Lafcadio Hearn's city. The setting between freshwater lake and Sea of Japan tidal flats means seafood is spectacular at adjacent ryokan restaurants. Early morning bathers may glimpse sunrise over Lake Shinji, one of Japan's most celebrated views.