Duan Prefecture  Duanzhou or Duan Prefecture was a "zhou" (prefecture) in imperial China in modern Guangdong, China, centering on modern Zhaoqing. Duan Prefecture was a major production center of inkstones. The modern Duanzhou District in Zhaoqing is named after the prefecture. Duan Prefecture administered the following counties () through history (Sui dynasty, Tang dynasty, Southern Han and Song dynasty):