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10 live or upcoming listings · 14 index records · 2 countries / territories in the current index.
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Fukiage Open-Air Hot Spring
A 24-hour mountain open-air hot spring on Mt. Tokachi. The official Hokkaido guide notes only a simple changing area and recommends swimsuits or a towel wrap for female visitors.
Hirauchi Kaichu Onsen
A tidal seaside hot spring on Yakushima. JNTO describes it as mixed bathing and explicitly says bathers go in nude; access is limited to the period around low tide.
Hottarakashi Onsen
A panoramic open-air onsen overlooking the Kofu basin and Mt. Fuji. It is an onsen environment rather than an unrestricted public-nudity area.
Ike-no-Yu
A quiet lakeside mixed open-air hot spring with simple separate changing rooms, listed by Hokkaido's official tourism site.
Kotan no Yu
A lakeside open-air hot spring by Lake Kussharo. The official tourism guide says the men's and women's sides are divided by large rocks and that swimsuits or towel wraps are also allowed.
Kuma-no-Yu
A free open-air hot spring beside the Rausu River. The official Hokkaido guide says men's and women's baths and changing areas are separated; the women’s side has additional screening.
Mizunashi Kaihin Hot Spring
A natural seaside open-air bath that appears for a few hours around low tide. Hokkaido's official tourism site lists separate changing rooms and directs visitors to Hakodate City's tide schedule.
Nakadake Hot Spring
A wild mountain hot spring reached on foot. Hokkaido's official tourism site explicitly states that bathers can enter completely naked, although nudity is not mandatory.
Saki-no-Yu
An ocean-facing open-air onsen in Shirahama, highlighted by JNTO for its Pacific views and sea spray. Standard Japanese onsen bathing etiquette applies unless the facility posts otherwise.
Wakoto Hot Spring
A mixed-gender crescent-shaped open-air bath at the base of Wakoto Peninsula. The official guide recommends swimwear because the area can be busy with tourists.