Okuhida Onsen Region

Located at the northernmost point of the Okuhida region, featuring multiple spring sources in the upper Kameda River. Known for its effervescent carbonated waters. Serves as an access point for the Shinhotaka Ropeway, drawing many climbers. Despite its remote mountain location, it offers several inns and rotenburo facilities, balancing the appeal of a hidden spring with practical amenities.

Seven hidden hot springs deep in Akita's mountains. Known for milky sulfur waters, Tsurunoyu with its thatched roof is called 'Japan's best hidden spring.' An ultimate onsen experience in nature.

Five hot spring towns at the foot of the Northern Alps. Said to have the most open-air baths in Japan, its outdoor baths overlooking 3,000m peaks offer breathtaking scale.

A hidden spring in Mount Hakkoda famous for its 'Sennin-buro' (1,000-person bath). The massive 160-tatami hiba wood bathhouse is awe-inspiring. Located in one of Japan's heaviest snowfall areas.

A hot spring resort in Gero, Gifu, counted among Japan's three most famous spas. Alkaline simple spring known as 'beautiful skin water' for its silky properties. Historic onsen town atmosphere preserved. Approximately 1 million visitors annually. Prospered as a therapeutic spa since the Edo period.

Open-air bathing experiences at distinctively colored hot springs in Beppu, such as the Blue Hell, accessible to tourists as part of the Hell Tour. Many facilities offer authentic soaking while functioning as tourist attractions, exemplifying the diversity of Japanese hot spring culture and tourism evolution. Used by approximately 1 million visitors annually.

An open-air bath culture exemplified by nine remote mountain onsen inns in the Oku-Okhotsk valley, Nikko, Tochigi. These intimate facilities offer rustic rotenburo seamlessly integrated with nature. Guests experience bathing amid snow in winter, cherry blossoms in spring, and autumn foliage—embodying Japanese onsen aesthetics. Its difficult access preserves its character as a hidden gem in serene wilderness.