Zhèn'ān

Zhen'an was a Zhuang native jurisdiction on the Annam frontier in western Guangxi. The Yuan raised it to a route in 1292, with its seat at present-day Napo.

The Ming made Zhen'an a prefecture in 1369 and moved its seat east to Debao. Guishun department, re-established in 1363, returned to its jurisdiction in 1496. The Qing stationed an assistant prefect there in 1663, converted it to an ordinary prefecture in 1729, and made Tianbao County its seat in 1738.