Danzhou or Dan Prefecture (丹州) was a zhou (prefecture) in imperial China seated in modern Yichuan County, Shaanxi, China. It existed (intermittently) from 554 until 1269, after the territory fell to the Mongols.
References
Shi Weile, ed. (2005). Zhongguo Lishi Diming Da Cidian (中国历史地名大词典) [Large Dictionary of Chinese Historical Place Names] (in Chinese). China Social Sciences Press. pp. 2214–2215. ISBN7-5004-4929-1.