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Mount Kusatsu-Shirane (草津白根山 Kusatsu Shirane-san^?) is a 2160-meter active volcano in Kusatsu, Gunma, Japan. It is called Kusatsu Shirane to differentiate it from the Mount Nikkō-Shirane on the other side of Gunma Prefecture. The summit of Kusatsu-Shirane volcano, located immediately north of Asama volcano, consists of a series of overlapping pyroclastic cones and three crater lakes. The largest of these is Yu-gama, an acidic turquoise-colored lake with rafts of yellow sulfur floating on its surface.