Hakuba Ryujin Onsen RYOKAN SUI, located in Hakuba village, Nagano Prefecture, is a refined facility created by carefully renovating a historic building. In addition to its weakly alkaline, skin-beautifying waters continuously fed from the source, the layout — with a direct flow from the sauna room to the cold plunge bath and then to the open-air bath — is highly praised by sauna enthusiasts. In winter you can even enjoy diving into the piled-up snow in the outdoor area.