Tan Prefecture (Beijing)

Tanzhou or Tan Prefecture () was a "zhou" (prefecture) in imperial China, centering on modern Miyun County, Beijing, China. It existed (intermittently) from 596 to 1368. In the 10th century it was ceded by Later Jin to the Khitan-ruled Liao dynasty as one of the Sixteen Prefectures.
Geography.
The administrative region of Tan Prefecture in the Tang dynasty is in modern Beijing. It probably includes parts of modern: 