Muikamachi Onsen-go

Two inns and a foot bath at the mouth of the Kiyotsu gorge, counted among the three great gorges of Japan for the columnar rock walling it in. The sulfur water at Kiyotsukan is said to have been located through a vision of Yakushi Nyorai, and the inn belongs to the association that keeps Japan's hidden hot springs. Most visitors come for the gorge tunnel, whose far chamber holds a shallow pool that mirrors the cliffs.

Ski-and-onsen town on the Joetsu Shinkansen, immortalized by Kawabata's 'Snow Country'. Cluster of 10+ onsen along the Uono Valley.

Group of 18 onsen along the upper Tone River in northern Gunma, surrounded by Tanigawa-dake. Big snow country with skiing, rafting, and rotenburo.

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.