A sauna with a round window overlooking the sea, and Ito spring water rising from 1,000m underground
Shizuoka Ito City
"Asahino-yu Seaside Spa" is a day-use hot spring facility inside Izu's gateway, Ito Marine Town Roadside Station. The dry sauna in the large public bath has a round window with a panoramic view of the sea, allowing you to work up a pleasant sweat while gazing at the horizon of Sagami-nada. The hot spring is a chloride and sulfate spring that rises from 1,000m underground, and you can relax in a variety of baths with different water temperatures. With aroma-scented sauna sessions, a crisp cold plunge bath, and an open-air bath where you can feel the sea breeze, it is the perfect place to refresh yourself while enjoying the panoramic views of Sagami Bay between drives.
TypeNatural Hot Spring
A calcium, sodium chloride and sulfate hot spring. The spring water rises from 1,000m underground and is offered through a combination of free-flowing and circulating systems. The saline water has excellent heat-retention properties, and you can fully enjoy its rich benefits in the open-air bath where you can feel the sea breeze.
Sauna TypeDry Sauna
Stove TypeConvection Stove (Sauna Stone)
Capacity10people
In addition to the steady 90°C heat, the room is sometimes filled with the aroma of essential oils depending on the time of day, further enhancing the relaxing effect. The sweating experience while looking out at the sea refreshes and relieves travel fatigue in a delightfully invigorating way.
Water QualityTap Water
Capacity3people
A pleasantly cool cold plunge bath located right next to the sauna. Its consistently set temperature gently cools down your heated body after the sauna, providing a refreshing contrast bath experience that leaves you feeling pleasantly revitalized.
Closed Days: None
〒414-0002 571-19 Yukawa, Ito City, Shizuoka Prefecture
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
A sauna with a round window overlooking the sea, and Ito spring water rising from 1,000m underground
Shizuoka Ito City
"Asahino-yu Seaside Spa" is a day-use hot spring facility inside Izu's gateway, Ito Marine Town Roadside Station. The dry sauna in the large public bath has a round window with a panoramic view of the sea, allowing you to work up a pleasant sweat while gazing at the horizon of Sagami-nada. The hot spring is a chloride and sulfate spring that rises from 1,000m underground, and you can relax in a variety of baths with different water temperatures. With aroma-scented sauna sessions, a crisp cold plunge bath, and an open-air bath where you can feel the sea breeze, it is the perfect place to refresh yourself while enjoying the panoramic views of Sagami Bay between drives.
TypeNatural Hot Spring
A calcium, sodium chloride and sulfate hot spring. The spring water rises from 1,000m underground and is offered through a combination of free-flowing and circulating systems. The saline water has excellent heat-retention properties, and you can fully enjoy its rich benefits in the open-air bath where you can feel the sea breeze.
Sauna TypeDry Sauna
Stove TypeConvection Stove (Sauna Stone)
Capacity10people
In addition to the steady 90°C heat, the room is sometimes filled with the aroma of essential oils depending on the time of day, further enhancing the relaxing effect. The sweating experience while looking out at the sea refreshes and relieves travel fatigue in a delightfully invigorating way.
Water QualityTap Water
Capacity3people
A pleasantly cool cold plunge bath located right next to the sauna. Its consistently set temperature gently cools down your heated body after the sauna, providing a refreshing contrast bath experience that leaves you feeling pleasantly revitalized.
Closed Days: None
〒414-0002 571-19 Yukawa, Ito City, Shizuoka Prefecture
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