The Watarase River runs through Midori City like a spine, and the landscape along its banks carries layers that take time to read. The city itself came together in 2006, when three separate municipalities — Kasukabe, Omama, and Higashimura — merged into one irregular shape, hemmed in on both sides by Kiryu. That administrative oddness is visible on the ground: the terrain shifts from flatland in the south to the forested slopes of the Ashio mountains in the north, and the communities along the way feel distinct from one another, shaped by different histories.
Those histories run deep. The Iwajuku site sits within the city's boundaries, the place where evidence of Japan's Paleolithic culture was first uncovered, and the Iwajuku Museum holds that story carefully. Closer to the river, the Omama Museum occupies a bank building from the Taisho era, its interior now given over to conodonts — the small fossilized organisms that make this corner of Gunma unexpectedly significant to geologists. At the old Nagame theater, built in 1937, a hand-cranked revolving stage still turns. The Ashio copper mine's long shadow falls across the Watarase basin too, through the history of the ore pollution incident that shaped the region's environmental memory.
The Tomihiro Museum exhibits the poetry and paintings of Hoshino Tomihiro, housed in a building that received the Architectural Institute of Japan Award. The Omama Gion Festival, organized by Omama Shinmeigu shrine, is counted among the three great Gion festivals of Joshu. Local farms grow tomatoes and eggplant, and the flower bread called hana-pan circulates quietly among those who know the area. The Kusaki Lake Marathon and the sunflower festival mark the calendar in ways that belong entirely to this place, not to any tourist circuit.
Where to stay
A day is rarely enough.
Booking through these links supports AURA at no extra cost to you.
What converges here
2 in this city. 20 within 25 km of the city hall.
- Midori City Omama Museum
- Tomihio Art Museum
- Kennen Kinenkan
- Okawa Museum of Art
- Maehara 20th Gallery and Museum in Kiryu
See 15 more
- Aikawa Archaeological Museum
- Art Museum & Library, Ota
- Nittanoshō History Museum
- Subaru Visitor Center
- Tamamura History Museum
- Shibusawa Eiichi Memorial Museum
- Maebashi City Museum of Literature
- Arts Maebashi
- Hirosegawa Museum
- Gunma Prefectural Museum of History
- The Museum of Modern Art, Gunma
- Honjō-Waseda no Mori Museum
- Kurita Museum
- Gunma Museum of Art, Tatebayashi
- Minamishimo Kofun Park
Distances are straight-line from the municipal office. Each website was checked in September 2026.
- Iwajuku Site
- Nishikashida Nakajima Site
- Akagi
- Akagi
- Iwajuku
- Azami
- Omama
- Kobe
- Hanawa
- Kamikanbai
- Soري
- Konaka
- Nakano