Rich in active gases or metals — a strong mineral character.
Buoyancy
Standard buoyancy
LowHigh
Soft water — natural, classic buoyancy.
SoufreSulfuresSulfates
Oze Tokura Onsen is nestled in Katashina Village in Gunma Prefecture, where it serves as a key gateway to the Oze highland plateau, one of Japan's most celebrated wetland nature preserves and a magnet for hikers from across the country. The spring flows with bicarbonate and sulfurous thermal waters and forms part of the Katashina Onsenkyō cluster alongside Kamata, Katashina, Hataya, and Marunuma onsens, offering visitors multiple bathing options within this mountainous village. Its pure mountain waters and forested surroundings provide restorative comfort after a day exploring the rare alpine marshlands and wildflower meadows of the Oze national protected area.
Insider tip — Oze Tokura Onsen serves as the gateway hot spring for the Oze National Park, Japan's largest highland moor, in northern Gunma Prefecture. The bicarbonate-sulfurous waters are a restorative reward after trekking wooden boardwalk trails through the marshy plateau where water lilies bloom in June. Small mountain lodges here have welcomed hikers and naturalists for over a century, preserving an authentic wilderness-adjacent onsen culture. The emerald-green Oze River flowing past the bathing facilities adds natural sound therapy to every soak.
