Asamushi Onsen

A premier therapeutic hot spring at the base of Mt. Hakkoda, Aomori Prefecture. Renowned for its strong acidic waters, historically used for treating skin conditions and gynecological ailments. Its main bath, 'Hiba Sennin-buro' (Cypress thousand-person bath), is a massive ~50-tatami wood bath carved from 150+ year-old cypress, featuring unique temperature-layered circulation. Winter snow bathing is particularly sublime.

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 small hot spring resort in Yamanouchi, Nagano Prefecture. Featuring approximately 80 traditional inns, it is known for its unique 'yumeguri' tradition where guests bathe in nine public bathhouses. Renowned for its old-fashioned charm and rustic atmosphere, it attracts many backpackers and younger tourists seeking an authentic onsen experience.

A collection of hot spring resorts on the Noto Peninsula, Ishikawa Prefecture, including Wakaura Onsen and Wajima Onsen. Featuring open-air baths with views of the Japan Sea, tourism increasingly combines hot spring bathing with agricultural experiences and home-stay culture. Attracting approximately 500,000 visitors annually, it functions as an important regional tourism industry.

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.

A hot spring in Mimasaka, Okayama, discovered in the late Edo period. Its soft, alkaline-simple waters are gentle on the skin. Historically visited by young Hideyo Noguchi for hydrotherapy, it is known as 'beauty water.' The tradition of shared public baths continues, preserving the intimate mingling of locals and tourists characteristic of authentic onsen towns.