Gunma
5 onsen areas
Manza Onsen
Japan's highest onsenchi, at 1,800 m on the slopes of Mt. Shirane in Gunma. Strongly acidic milky-white sulfur waters (pH 2.5) from one of the country's most active geothermal fields, with rotenburo open to alpine views year-round.
Shima Onsen
Quiet Gunma valley onsen designated 国民保養温泉地 #1 in 1954. The 'forty-thousand cures' name nods to its medicinal reputation.
Ikaho Onsen
Gunma hillside onsen built around a 365-step stone staircase. Famous 'gold' (iron-bearing) and 'white' (sulfate) waters.
Minakami Onsen-kyo
Group of 18 onsen along the upper Tone River in northern Gunma, surrounded by Tanigawa-dake. Big snow country with skiing, rafting, and rotenburo.
Kusatsu Onsen
One of the three great onsen of Japan (Sanmeisen). Famously hot, acidic waters; the wooden yubatake in the town center funnels source water into cooling channels.