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Located in the mountains of the Akita Towada-Hachimantai National Park, Tamagawa Onsen is a unique hot spring resort! Indeed the onsen is famous for having Japan’s most acidic hot spring water with a pH of around 1. It features a very rare radioactive stone, known as Hokutolite. The stone is believed to have a wide range of health benefits, including but not limited to preventing cancer, thus attracting many cancer patients across Japan. The Tamagawa Onsen valley is also the place of Japan’s single most p
