Tanzhou_(in_modern_Hunan)
Tan Prefecture (Hunan)
Historical administrative division in Hunan, China
Tanzhou or Tan Prefecture (潭州) was a zhou (prefecture) in imperial China centering on modern Changsha, Hunan, China. In the Yuan dynasty it was known as Tanzhou Route (潭州路) and in the Ming dynasty as Tanzhou Prefecture (潭州府). It existed (intermittently) from 589 to 1372.