Gunma Prefecture (or Gumma) (群馬県, Gunma-ken) is located in the northwest corner of the Kantō region on Honshū island, Japan. Its capital is Maebashi. One of only eight landlocked prefectures, Gunma is the northwestern-most prefecture of the Kantō plain. Except for the central and southeast areas, where most of the population is concentrated, it is mostly mountainous. To the north are Niigata and Fukushima prefectures, while to the east lies Tochigi. To the west lies Nagano prefecture, and Saitama is to the south. Some of the main mountains of Gunma are Mount Akagi, Mount Haruna, Mount Miyogi, Mount Nikkō-Shirane and Mount Asama, which is located on the Nagano border. The major rivers include the Tone River, the Agatsuma River, and the Karasu River.
