Soak in 100% free-flowing spring water, a 100-degree sauna, and house-made beer
Hokkaido Iwanai Town
"Iwanai Kogen Hotel" is a highland inn in Iwanai, Hokkaido, with sweeping views of the Shakotan Peninsula. Guests can fully enjoy the rare Iwanai Onsen, offered as 100% free-flowing natural spring water, whose gentle texture deeply soothes both body and mind. The sauna is a full-fledged dry sauna set at 100 degrees, and self-löyly lets you enjoy powerfully rising heat. A cool cold plunge bath filled with water drawn from underground springs and outdoor bathing surrounded by magnificent nature provide the ultimate totonou experience. The property also includes an in-house craft beer brewery and a Picasso museum, offering a stay that satisfies all five senses.
TypeNatural Hot Spring
A natural hot spring with sodium chloride bicarbonate spring water. It is provided as 100% free-flowing spring water, and its abundant minerals gently smooth and soften the skin. In the open-air bath overlooking the Shakotan Peninsula, you can enjoy a luxurious bath while taking in the spectacular scenery.
Sauna TypeDry Sauna
Stove TypeConvection Stove (Sauna Stone)
Capacity8people
A dry sauna characterized by powerful heat set at 100 degrees. Self-löyly is available, so by pouring water over the sauna stones, you can feel the steam and heat waves rising at once throughout your body. In the three-tiered room, you can enjoy an authentic sauna session at your preferred height.
Water QualityNatural Water (Groundwater, Spring, etc.)
Capacity2people
A cold plunge bath using natural water drawn from underground springs. The crisp, cold temperature and the soft feel unique to natural water refreshingly tighten the body after sauna use. In a clean bath, you can experience high-quality cooldown time.
Closed Days: None
〒045-0024 505 Notake, Iwanai, Iwanai District, Hokkaido
Gender Access
Gender Separated
Curated by an expert who visits onsen and sauna facilities every day and has explored 300+ locations — only facilities confirmed to be truly exceptional are featured.
Learn more
Soak in 100% free-flowing spring water, a 100-degree sauna, and house-made beer
Hokkaido Iwanai Town
"Iwanai Kogen Hotel" is a highland inn in Iwanai, Hokkaido, with sweeping views of the Shakotan Peninsula. Guests can fully enjoy the rare Iwanai Onsen, offered as 100% free-flowing natural spring water, whose gentle texture deeply soothes both body and mind. The sauna is a full-fledged dry sauna set at 100 degrees, and self-löyly lets you enjoy powerfully rising heat. A cool cold plunge bath filled with water drawn from underground springs and outdoor bathing surrounded by magnificent nature provide the ultimate totonou experience. The property also includes an in-house craft beer brewery and a Picasso museum, offering a stay that satisfies all five senses.
TypeNatural Hot Spring
A natural hot spring with sodium chloride bicarbonate spring water. It is provided as 100% free-flowing spring water, and its abundant minerals gently smooth and soften the skin. In the open-air bath overlooking the Shakotan Peninsula, you can enjoy a luxurious bath while taking in the spectacular scenery.
Sauna TypeDry Sauna
Stove TypeConvection Stove (Sauna Stone)
Capacity8people
A dry sauna characterized by powerful heat set at 100 degrees. Self-löyly is available, so by pouring water over the sauna stones, you can feel the steam and heat waves rising at once throughout your body. In the three-tiered room, you can enjoy an authentic sauna session at your preferred height.
Water QualityNatural Water (Groundwater, Spring, etc.)
Capacity2people
A cold plunge bath using natural water drawn from underground springs. The crisp, cold temperature and the soft feel unique to natural water refreshingly tighten the body after sauna use. In a clean bath, you can experience high-quality cooldown time.
Closed Days: None
〒045-0024 505 Notake, Iwanai, Iwanai District, Hokkaido
Gender Access
Gender Separated
Curated by an expert who visits onsen and sauna facilities every day and has explored 300+ locations — only facilities confirmed to be truly exceptional are featured.
Learn more