Spectacular open-air baths with a sweeping view of the Pacific Ocean, and a nano-mist sauna that is also drawing attention in the medical field.
Ibaraki Hitachinaka City
A bath facility with a prime location right in front of the Pacific Ocean. The hot spring that gushes from 1,504m underground is a sodium-chloride strong saline spring made from aged ancient fossil seawater, and it boasts one of the highest mineral concentrations in the Kanto region. From the panoramic rock bath, you can take in a sweeping view of the sea at Ajigaura, and soaking while listening to the sound of the waves is truly exceptional. The 45-degree nano-mist sauna, which places little strain on the body and is expected to deliver excellent perspiration and relaxation benefits, is popular with health-conscious guests.
TypeNatural Hot Spring
A natural hot spring with an extremely high mineral concentration, using ancient fossil seawater that gushes from 1,504m underground. Because the salt coats the skin, its warming effect is extremely high, and the comforting warmth lasts even after you get out of the bath.
Sauna TypeMist Sauna
Capacity15people
A low-temperature sauna that gently envelops the whole body in ultra-fine nano mist, placing little strain on the body or skin. Using a system also adopted in thermal therapy at medical institutions, it encourages deep relaxation and efficient perspiration.
Water QualityTap Water
Capacity2people
A cold water bath set at about 16 degrees that gently cools down a body warmed up after the nano-mist sauna. It is installed in two places, one in the indoor bath and one in the open-air bath, so you can enjoy cooling down in your preferred setting.
Closed Days: Thursday
〒311-1201 Ibaraki Prefecture, Hitachinaka City, Ajigaura-cho 3290
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
Spectacular open-air baths with a sweeping view of the Pacific Ocean, and a nano-mist sauna that is also drawing attention in the medical field.
Ibaraki Hitachinaka City
A bath facility with a prime location right in front of the Pacific Ocean. The hot spring that gushes from 1,504m underground is a sodium-chloride strong saline spring made from aged ancient fossil seawater, and it boasts one of the highest mineral concentrations in the Kanto region. From the panoramic rock bath, you can take in a sweeping view of the sea at Ajigaura, and soaking while listening to the sound of the waves is truly exceptional. The 45-degree nano-mist sauna, which places little strain on the body and is expected to deliver excellent perspiration and relaxation benefits, is popular with health-conscious guests.
TypeNatural Hot Spring
A natural hot spring with an extremely high mineral concentration, using ancient fossil seawater that gushes from 1,504m underground. Because the salt coats the skin, its warming effect is extremely high, and the comforting warmth lasts even after you get out of the bath.
Sauna TypeMist Sauna
Capacity15people
A low-temperature sauna that gently envelops the whole body in ultra-fine nano mist, placing little strain on the body or skin. Using a system also adopted in thermal therapy at medical institutions, it encourages deep relaxation and efficient perspiration.
Water QualityTap Water
Capacity2people
A cold water bath set at about 16 degrees that gently cools down a body warmed up after the nano-mist sauna. It is installed in two places, one in the indoor bath and one in the open-air bath, so you can enjoy cooling down in your preferred setting.
Closed Days: Thursday
〒311-1201 Ibaraki Prefecture, Hitachinaka City, Ajigaura-cho 3290
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