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"One of the largest, most modern spa complexes in greater Tokyo, this Shinjuku facility sources water daily from Nakaizu’s Jindai no Yu — famed as the “waters of beauty” — to fill a large outdoor onsen tub in the heart of the city. Indoor offerings include high-concentration carbon dioxide baths reputed for healing properties, steam saunas to promote sweating, and a women-only area with an extra aroma sauna; dining options and a juice bar allow visitors to pair bathing with meals or detox drinks." - James Wong