Rotenburo Outdoor Bath (露天風呂 - Rotenburo)
An outdoor hot spring bath surrounded by gorgeous nature, gardens, or mountain views ('Rotenburo'). It offers the ultimate luxury of inhaling cool, fresh mountain air while soaking your lower body in hot thermal water.
Originated from ancient wild geysers where volcanic hunters bathed without shelters. This merged with Japanese architecture and garden landscape art, refining into the high-end Rotenburo experience.
Wash inside first, soak in the indoor bath, then slide open the door to the Rotenburo area. Step out into the cool air and slowly submerge to enjoy the perfect hot-cold head-to-toe sensory experience.
What is the famous outdoor natural hot spring surrounded by nature called?