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Historical second-order administrative division in Japan

List of historical second-order administrative division in Japan (found 10 locations). Category description: A former second-order administrative division

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Oe-gun
Ogasa-gun
Onyū-gun
Ōgi-mura (Tokyo)
Ōita-gun
Ōkawa-gun
Ōkuchi-shi
Ōmagari-shi
Ōmi-machi
Ōno-gun