Relaxing — deep, immediate muscle release.
Loaded with major ions — the essential minerals (Ca, Mg).
Dense, salty water — you float without effort.
Iwanai, on the Sea of Japan coast of Hokkaido where the Shiribeshi subprefecture faces the open ocean, is a historic fishing port whose traditional herring fishery once made it one of the most productive fishing communities in all of Hokkaido, the legacy of the great herring fishing boom preserved in the distinctive herring mansion (nishin goten) heritage buildings scattered along the northern Hokkaido coast. Iwanai Onsen Hokkaido draws on chloride-rich coastal thermal waters from the marine geological formations of the Iwanai Bay coastline, providing warming maritime baths in a historic fishing port whose herring fishing heritage, traditional nishin goten architecture, and the Sea of Japan coastal scenery with views toward the Shakotan Peninsula create an appealingly nostalgic and maritime spa setting. The traditional nishin goten herring merchant mansion architecture, the Iwanai fishing harbour fresh catch culture, and the coastal road scenery of the Hokkaido Sea of Japan coast connecting Iwanai to the Niseko highland resort zone inland create a pleasantly historic and naturally coastal spa destination in the Shiribeshi fishing coast of Hokkaido.