Nagasaki Sasebo City
A spectacular open-air bath that appears to merge with Omura Bay and a natural onsen that retains heat exceptionally well
Ooedo Onsen Monogatari Premium Saikaibashi is an onsen resort hotel in Sasebo, Nagasaki. Its infinity open-air bath overlooking Omura Bay offers a remarkable sense of openness, making you feel at one with the sea, sky, and surrounding nature. The time spent watching boats pass by while feeling the gentle sea breeze is truly special. The main bathhouse has a dry sauna for both men and women, where you can sit in the heat and work up a satisfying sweat. The onsen is a chloride spring with excellent heat-retaining properties, warming you to your core and helping you stay warm after bathing. With a low-temperature warm-stone room exclusively for women and an airy floating lounge, you can fully savor an elegant seaside resort stay.

The main bathhouse has an infinity open-air bath with sweeping ocean views that seem to merge with Omura Bay, as well as an indoor bath beneath an impressive open ceiling. The water is a highly concentrated chloride onsen with exceptional heat-retaining properties, warming you to your core and helping you stay warm after bathing. Bathing while feeling the gentle sea breeze and gazing at passing boats or the dawn-lit sky is a special experience.

A dry sauna in each of the men’s and women’s main bathhouses. In the quiet room, where the heat builds steadily, you can leave the bustle of everyday life behind and sit with the heat. It gently draws sweat from deep within, creating a soothing space that enhances the effects of bathing.

A cold plunge reserved for the men’s main bathhouse, where the cold pulls taut a body thoroughly warmed in the sauna. The chill envelops you from head to toe, refreshing your heat-flushed body. Afterward, you can move smoothly into a pleasant cooldown while feeling the sea breeze.

A soothing space exclusively for women, kept slightly cooler than a typical warm-stone room. Before or after an onsen bath, or whenever you want to warm up just a little, you can enjoy a gentle, comfortable sweat. Lie back at your leisure while browsing this magazine, and unwind in this blissful place until you lose track of time.
Availability and rates are shown on each booking site.
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Main bathhouse and open-air bath: 15:00–24:00 / 5:00–10:00 Sauna: 15:00–24:00 / 7:00–10:00
Guests with tattoos, imitation tattoo stickers, or body paint may not use the main bathhouse. However, guests whose tattoos can be completely covered by two 10 cm x 14 cm cover stickers may use the main bathhouse, provided they wear the designated cover stickers. Cover stickers are available at the front desk for ¥220 per sticker, including tax.
By car
By train and bus
Shuttle service
Free parking for about 90 cars
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