De Prefecture

Dezhou or De Prefecture () was a "zhou" (prefecture) in imperial China, centering on modern Dezhou, Shandong, China. It existed (intermittently) from 589 until 1913.
The modern prefectural-level city Dezhou, created in 1948, retains its name.
Geography.
The administrative region of De Prefecture in the Tang dynasty is in modern northern Shandong and southeastern Hebei. It probably includes parts of modern: 