Naganohara, Gunma

The elevation shifts noticeably as the JR Agatsuma Line climbs westward through Gunma, the valley narrowing until the gorge walls of Agatsuma Keikoky rise on either side — sheer rock faces above the river, the water moving fast below. This is Naganohara-machi territory, shaped by two volcanoes at opposite ends: Kusatsu-Shiranesan to the north, Asama to the south, the land between them a tilted plateau of volcanic ash soil where the air carries a different weight.

Kawarayu Onsen sits on a rebuilt terrace above what was once its original ground, relocated when the Yamba Dam project finally closed after decades of construction and dispute. The shared bathhouse Oyu still operates, and the source-spring eggs sold nearby are a quiet reminder that the water here has its own chemistry. Across the plateau, Kita-Karuizawa carries a different kind of history — the 1920s Hosei University village brought writers and intellectuals to build summer lodges, and that pattern of highland retreat has never entirely dissolved. The old Kita-Karuizawa station building from 1930, modeled on Zenkoji's architectural idiom, stands now as a monument near Makimiya Shrine rather than a working platform.

In January, the Yukake Matsuri draws locals to pour hot spring water in ritual. In August, the Dango Sumo at Ojoshiro Shrine follows its own calendar. Asama-Kakushi-yama offers a manageable summit climb with wide views, while Yamba Agatsuma Lake, formed only in 2020, gives the valley a new surface to read the sky from. The dairy products from Asama Bokujyo still come from the same high pastures where the plateau opens out toward the treeline.