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Tohoku region (northernmost six prefectures of Honshu)
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Kanto region (inc. Tokyo, Kanagawa, Saitama, Gunma, Tochigi, Ibaraki and Chiba prefectures)
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Chubu region (inc. Aichi, Nagano, Shizuoka, Niigata, Toyama, Ishikawa, Fukui, Yamanashi and Gifu prefectures)
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Kinki region (inc. Osaka, Kyoto, Hyogo, Nara, Wakayama, Mie and Shiga prefectures)