Yubara Onsen — Tsuruno-yu Open-Air Hot Spring

Tsuruno-yu is a free, open-air hot spring bath set directly on a sand bar in the Asahi River at Yubara Onsen, a hot-spring town in Maniwa city in the mountains of northern Okayama. Unlike a conventional spa building, the setting is entirely outdoors: stone-lined pools built into the riverbank, framed by forested hills and, in autumn, by the illuminated Yubara suspension bridge nearby. Because the bath is a public facility rather than a commercial spa, there is no treatment menu or trained therapist on site; the draw is the mineral-rich riverside water itself and the open-air soak. Bathing is mixed (konyoku), and while modern etiquette has softened this in practice, women often wear a wrap or swimsuit-style covering. Visitors seeking more privacy or a conventional bathing experience can use the indoor and rotenburo baths at the ryokans lining the nearby streets, several of which offer day-use access with reservation and river views from their own open-air baths. Those ryokans typically include kaiseki multi-course dinners for overnight guests, extending the visit from a quick soak into a full onsen-town stay. There are no pools, saunas, or meditation rooms at Tsuruno-yu itself; the experience is intentionally simple. Because the free public bath has no gate or staff, access is unrestricted around the clock, though visiting after dark with limited lighting requires caution on the riverbank stones.