Where is Renjie Lanfang?

Towns in the northwest of Datang. Lan Fangdi Renjie refers to a plot in the TV series "Da Tang Di Gong Case". Lan Fang is the place where Di Renjie has been. According to the plot of the TV series "Di Gong Case of Datang", after Di solved the "Rain Master Case", he was transferred to Lanfang County, a small town in the northwest of Datang, because of a transfer order issued by Wuhou. There, he faced the black flame. Lanfang is located in the northwest border of Datang, where Han and Hu live together and the folk customs are fierce.