Iwatake no Yu, located right beside Hakuba Iwatake Mountain Resort, is a hot spring facility renowned for its mineral-rich chloride springs. The sauna, renovated in 2022, has been reborn as the Kuromoji Sauna using aromatic kuromoji wood from Nagano Prefecture, allowing you to sweat while wrapped in a deep, spice-like fragrance. A single-person cold plunge bath continuously supplied with groundwater and an outdoor snow relaxation area where you can even take a snow dive in winter offer a one-of-a-kind, refreshing experience.