What does it mean to return to Fang Jun in Han Dynasty? Do you mean the counties in the north?

It should be Shuofang county, and Shuofang's pinyin is Shuo fāng, which means north.

After the rise of Emperor Wu of the Han Dynasty, he began to recover the frontier of the Qin Dynasty. In the second year of Yuan Shuo (BC 127), Xiongnu invaded Yuyang and Shanggu, killing and injuring more than a thousand people. Liang Wudi ordered Wei Qing, the general who rode chariots, "to go out to the west, to the highest place, and then to the south of Henan, as for Longxi". Zhufuyan suggested that the land in the north is fertile and fertile, and it is appropriate to station in the field. "Introspection should turn to defending Cao Cao, spreading China widely and destroying Hu Zhi." Emperor Wu of the Han Dynasty listened to his words, so he "collected Henan land and set it in Shuofang and Wuyuan County".

In the Western Han Dynasty, the jurisdiction of Shuofang County was roughly equivalent to the northwest of Inner Mongolia Hetao and the area behind it (west of Ordos and southwest of Bayannaoer City), that is, the western half of Jiuyuan County in Qin Dynasty, which was called "New Qin" and the county was ruled in Shuofang County. Wuyuan county is in the east, Xiongnu is in the west and north. There is Gill plug in the west of the county seat (now Taohaisumu Taiyangmiao Mountain in Dengkou County, Naishan Mountain Pass, Longue) and Gaoque plug in the north (in the future, Qihu, Wulate, Bayannaoer and Wendur Town, Langshan Dabatu Goukou), which is an important passage for Han and Xiongnu in Yinshan area. The story of Zhaojun's departure from the fortress happened here. In the first year of Han Jingning (the first 33 years), Wang Zhaojun went to the Xiongnu.

Emperor Wu of the Han Dynasty moved to the four counties of Shuofang, Wuyuan, Shang Jun and Beidi for many times, and dug canals, settled fields and defended them, and built the Great Wall and fortresses. In the second year of Yuanshuo, 100,000 people moved to Shuofang. In the autumn of three years (before 126), Su Jian restored the fortress built by Meng Tian in Qin Dynasty and built Shuofang City. Five years, built near Rongcheng. In the second year of Yuanshou (before 12 1), hundreds of thousands of poor people moved to the "New Qin Middle" area south of Shuofang. In three years, Woye City and Sanfeng City were built. Ding Yuan six years ago (1 1 1 years ago), "Shang Jun, Shuofang, Xihe and Hexi opened fields and dismissed 600,000 soldiers to guard fields". In the first year of Yuanfeng (BC 1 10), Emperor Wu toured the north to Shuofang. In the fourth year of the Republic of China, "General Hu Guo Changtun was sent to the north". Large-scale immigration has led to a rapid increase in the Han population in Hetao area. In the second year of Emperor Han Ping (2 years), there were 34,338 households136,628 people in Shuofang County.