Nurukawa Onsen

A gentle simple thermal spring — lightly mineralized, without the sharp edges an acidic or sulfurous water brings. The wellhead itself is fierce, sitting among Japan's hottest natural sources, yet the water is soft and undemanding on the skin. The posted notice lists the spring-type indications for simple thermal water — autonomic nervous system instability, insomnia, and depressed mood — framing this as a spring for settling the nerves rather than stimulating them. The posting covers bathing only; drinking requires a permit from the health authority.