Cao Prefecture

Caozhou or Cao Prefecture () was a "zhou" (prefecture) in imperial China centering on modern Heze or Cao County in Shandong, China. It existed (intermittently) from the 6th century to 1913.
Geography.
Under the Sui, Cao Prefecture included Yuanqu County. The administrative region of Caozhou in the Tang dynasty is in the border region of modern southwestern Shandong and eastern Henan. It probably includes parts of modern: 