Relax in a fine architectural gem with spectacular views of Iwanai Port and 100% free-flowing natural hot spring water
Hokkaido Iwanai Town
"Iwanai Onsen Okaerinasai" is a hot spring inn located on a hill overlooking Iwanai Port in Iwanai Town, Hokkaido. It features a luxurious design that makes full use of the fine architecture of a former high-end ryokan, with abundant use of cypress and hiba wood. The natural hot spring is 100% free-flowing from the source, a sodium chloride and sodium bicarbonate spring, with a gentle texture that softly relaxes both body and mind. The sauna is equipped with an authentic dry sauna, set to deliver a solid, satisfying heat. With a crisp cold plunge bath and open-air bathing while taking in the stunning views of the Shakotan Peninsula, it offers a blissful totonou experience.
TypeNatural Hot Spring
A natural hot spring with sodium chloride and sodium bicarbonate spring water. It is offered as 100% free-flowing from the source, and is characterized by its gentle feel on the skin. You can enjoy a luxurious bath in an indoor bath made with abundant cypress wood, or in the open-air bath overlooking Iwanai Port.
Sauna TypeDry Sauna
Stove TypeConvection Stove (Sauna Stone)
Capacity8people
A calm dry sauna wrapped in the warmth of wood. The heat thoroughly envelops your whole body and encourages a comfortable sweat. In this quiet room, it is an authentic space where you can let the sweat flow while taking your time to face yourself.
Water QualityTap Water
Capacity2people
A cold plunge bath that prides itself on its crisp, chilled temperature setting. It quickly tightens up your heated body after the sauna and provides a refreshing sense of renewal. In a clean tub, you can experience a smooth cooldown.
Closed Days: None
491-21 Nozuka, Iwanai Town, Iwanai District, Hokkaido 045-0024
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
Relax in a fine architectural gem with spectacular views of Iwanai Port and 100% free-flowing natural hot spring water
Hokkaido Iwanai Town
"Iwanai Onsen Okaerinasai" is a hot spring inn located on a hill overlooking Iwanai Port in Iwanai Town, Hokkaido. It features a luxurious design that makes full use of the fine architecture of a former high-end ryokan, with abundant use of cypress and hiba wood. The natural hot spring is 100% free-flowing from the source, a sodium chloride and sodium bicarbonate spring, with a gentle texture that softly relaxes both body and mind. The sauna is equipped with an authentic dry sauna, set to deliver a solid, satisfying heat. With a crisp cold plunge bath and open-air bathing while taking in the stunning views of the Shakotan Peninsula, it offers a blissful totonou experience.
TypeNatural Hot Spring
A natural hot spring with sodium chloride and sodium bicarbonate spring water. It is offered as 100% free-flowing from the source, and is characterized by its gentle feel on the skin. You can enjoy a luxurious bath in an indoor bath made with abundant cypress wood, or in the open-air bath overlooking Iwanai Port.
Sauna TypeDry Sauna
Stove TypeConvection Stove (Sauna Stone)
Capacity8people
A calm dry sauna wrapped in the warmth of wood. The heat thoroughly envelops your whole body and encourages a comfortable sweat. In this quiet room, it is an authentic space where you can let the sweat flow while taking your time to face yourself.
Water QualityTap Water
Capacity2people
A cold plunge bath that prides itself on its crisp, chilled temperature setting. It quickly tightens up your heated body after the sauna and provides a refreshing sense of renewal. In a clean tub, you can experience a smooth cooldown.
Closed Days: None
491-21 Nozuka, Iwanai Town, Iwanai District, Hokkaido 045-0024
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