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The Balhae (or Bohai) kingdom controlled the northern Korean Peninsula, the area from the Amur River (Heilong Jiang) to the Strait of Tartary, and the Liaodong Peninsula. Similar to the workings of the Chinese Tang dynasty, the administration system of the Balhae kingdom was composed of:
- 5 capitals: a Supreme capital with four secondary capitals
- 15 provinces; and
- 62 prefectures.