Tamagawa Onsen, tucked within Towada-Hachimantai National Park in Akita Prefecture, is one of Japan’s most distinctive hot spring destinations. Known for its powerful, mineral-rich waters - the most acidic in Japan, it’s long been valued for its therapeutic benefits. The onsen sits in a dramatic volcanic landscape surrounded by steaming vents, rocky slopes, and forest trails.
Travellers can soak in outdoor baths with mountain views, experience natural steam saunas, or join locals using the hot stones for relaxation therapy. Nature lovers will enjoy the nearby hiking routes around Mount Yakeyama and Hachimantai, which are especially scenic in autumn. In winter, the area transforms into a peaceful snow-covered retreat.