Manza Kogen Hotel

The stone-garden open-air bath (sekitei rotenburo, 石庭露天風呂) is the reason to come here, eight pools fed by four distinct springs, most of them mixed-gender, with water ranging from the classic milky-white sulfur through a rare fluorescent yellow to clear. The sulfur content is about 27 times the standard threshold, and the mountain setting at over 1,800 meters adds to the atmosphere.