草津 · BEST 10
Soaking outdoors in a rotenburo (open-air bath) is the highlight of any ryokan stay — the same tub feels completely different with each season and hour of the day.
Top 10 of 22 properties, ranked by rating and popularity

Kusatsu · Gunma · Kusatsu
“A thousand years of history, Kusatsu's only natural rock bath”

Kusatsu · Gunma · Kusatsu
“A 30-meter bathhouse, Kusatsu's largest, filled with strongly acidic spring water”

Kusatsu · Gunma · Kusatsu
“A Kusatsu inn founded in 1598, with six free-flowing baths drawn from two sources”

Kusatsu · Gunma · Kusatsu
“Above Kusatsu town, a pilgrimage through twenty-three baths”

Kusatsu · Gunma · Kusatsu
“The Hakki Source Since 1193, Watched Over by Yumori”

Kusatsu · Gunma · Kusatsu
“The warmth of a wooden inn standing since 1913”

Kusatsu · Gunma · Kusatsu
“Yugawa no Yu, poured straight into your room's open-air bath”

Kusatsu · Gunma · Kusatsu
“Two minutes from the Yubatake, a stay like living here”

Kusatsu · Gunma · Kusatsu
“Facing the Yubatake, a night fed by two springs”

Kusatsu · Gunma · Kusatsu
“10 minutes on foot from Yubatake, a free-flowing Mandaiko-source onsen all to yourself in your room”