

It used to be called ‘the demons' spring’: here you find one of the largest rotenburo in Japan.
At the western end of the hot spring town, streams of hot water flow in plain view through mixed woodland: the old name of the place was 鬼の泉水, ‘the demons' spring’, because of the intensity of the geothermal activity. In the park there are memorial stones to figures linked to Kusatsu, including the German physician Erwin von Bälz, who made its waters known in Europe. At the end of the path there is an open-air hot spring bath, among the largest in Japan.
A public park in Kusatsu, Gunma Prefecture, within the protected area of Jōshin'etsu-kōgen National Park.
ℹ️ The park is open and free, always accessible. The rotenburo at the end of the path is open 7:00–20:00 from April to November and 9:00–20:00 from December to March (last entry 19:30); 800¥ adults, 400¥ children.
🚉 Kusatsu Bus Station · 11 min walk
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