Kokyu no Ma, Shiriuchi Onsen

Crafted by a historic ryokan in Shiriuchi with nearly 800 years of onsen legacy, this space blends hot spring bathing with sauna culture, surrounded by the vast natural beauty of Hokkaido. Free-flowing hot spring water circulates through the sauna room, creating gentle humidity, while bathing areas shaped by the flowing source invite deep relaxation and quiet immersion. A natural cold plunge whose temperature shifts with the seasons offers a refreshing contrast. Optional private two-hour bookings are also available, providing an intimate setting to share time with family and loved ones.