The main sauna on the Yama no Yu side. Stadium-shaped tiered seating offers a range of height zones so you can choose your preferred temperature. Far-infrared heating warms deeply and gently, producing a soft heat that feels less oppressive and is easy to stay in for longer periods. The spacious area provides a relaxed, roomy sweating experience.

A distinctive self-löyly sauna inspired by Beppu's hells, carrying the characters for flame and heat. Pouring water on the sauna stones sends up a sudden rush of steam, and heat waves swell forward to envelop the body. A glimpse of sky through the window offers a brief sense of calm, creating a striking contrast between searing heat and quietude. This is a room for experienced users who enjoy controlling humidity themselves.

A calm aroma sauna inspired by Northern Europe. You can warm slowly in gentle heat while being wrapped in fragrance. In contrast to saunas that pursue extreme temperatures, this space prioritizes relaxation and provides a pleasant finish when easing into a state of relaxation. It is also handy as a short restful stop between visits to multiple saunas.

This sauna adopts the IKI stove, born in Finland, recreating the smoky atmosphere of traditional saunas. Auto-löyly releases bursts of steam at set intervals, maintaining humidity while waves of heat strike the skin. The heat combines softness with a sharp edge, effectively drawing out sweat. Rich wood aromas and an authentic visual atmosphere deliver a genuinely traditional experience.

A salt sauna located on the Umi no Yu side. Salt is provided inside the room so you can apply it to your skin while gently sweating at a moderate temperature. The humid air helps condition the skin, offering a different refreshment approach from dry saunas. The design encourages longer stays and is beginner-friendly.

A unique sauna filled with the aromas of thirteen different herbal medicines. The kampo steam permeates the room and seems to reach deep into the body with each breath. The gentle temperature makes it easy to stay for extended periods, allowing you to surrender to the scents and achieve a distinctive relaxation experience.

Sourced from subsurface spring water of Mt. Tsurumi and continuously chilled by two cooling units (dual chillers), this extra-cold plunge bath is available in both Yama no Yu and Umi no Yu. It quickly resets the body temperature raised by the sauna. The baths are fed with abundant, constantly refreshed water that feels soft on the skin. After the cold plunge, you can unwind slowly on the outdoor relaxation deck.