The Chūbu, or central region, encompasses nine prefectures in the midland of Japan, west of the Kantō region: Aichi, Fukui, Gifu, Ishikawa, Nagano, Niigata, Shizuoka, Toyama, and Yamanashi. The region is the widest part of Honshū and is characterized by high, rugged mountains. The Japanese Alps divide the country into the sunnier Pacific side, known as the front of Japan, or Omote-Nihon, and the colder Sea of Japan side, or Ura-Nihon, the back of Japan. The region comprises three distinct districts.