Ishikari Onsen
A natural hot spring whose source is fossil seawater, ancient seawater from several million to ten million years ago trapped in geological layers. The tea-brown water has an extremely high salt concentration, and after bathing, a salt film wraps the skin, providing outstanding heat retention. Skin-beautifying benefits are also expected, and you can feel your skin becoming moist and hydrated. In the open-air bath and large communal bath overlooking the Sea of Japan, you can fully enjoy this nourishing ancient water.