Tangzhou or Tang Prefecture (唐州), briefly known as Bizhou or Bi Prefecture (泌州) from 906 to the late 940s, was a zhou (prefecture) in imperial China seated in modern Tanghe County in Henan, China. It existed (intermittently) from 626 to 1380.
Geography
The administrative region of Tangzhou in the Tang dynasty is in southern Henan. It probably includes parts of modern:
References
Tang Prefecture (Henan) Wikipedia(Text) CC BY-SA