Sainokawara Rotenburo

Sainokawara Rotenburo is a renowned open-air hot spring bath located in Kusatsu Onsen, Gunma Prefecture. Nestled within the scenic Sainokawara Park, this expansive rotenburo offers a unique bathing experience amidst natural surroundings.

Sainokawara Rotenburo is one of Japan's largest outdoor baths, comfortably accommodating up to 100 bathers at a time. The bath is divided into separate areas for men and women, with a wooden partition ensuring privacy.

The hot spring water, sourced from the Bandai spring, is known for its acidic chloride sulfate content, which is believed to aid in the treatment of chronic digestive diseases and assist in recovery from illness.