Chapter 19 Chapter Five: From Great Unification to Great Split: Sui, Tang, and Five Dynasties Periods

Although the Sui Dynasty existed for a short time, it established formal administrative regions on an unprecedented scale. In the north, the Sui Dynasty recaptured the Hetao area from the Turks and extended the border to the north of Yinshan Mountain. The northern borders of Wuyuan and Dingxiang counties were close to the present-day Sino-Mongolian border. In the northwest, the Sui Dynasty acquired the present-day Hami region of Xinjiang from the Turks, and established Yiwu County in the fourth year of Daye (608 A.D.).Taking advantage of Tuyuhun's defeat by Tie Le, Emperor Yang of the Sui Dynasty destroyed Tuyuhun and acquired its hometown. South of the county), Xihai (where the government is now Gufucheng in the west of Qinghai Lake) and Heyuan (where the government is located in the southeast of Xinghai County, Qinghai today) are four counties. The east bank and the Tarim Basin in the west are basically places where no formal administrative area has ever been set up before.

At the beginning of the Sui Dynasty, it expanded in the Yunnan-Guizhou Plateau. In the thirteenth year of Kaihuang (593 A.D.), Yuwei (now Qujing City, Yunnan Province) was established as the general manager of Nanning Prefecture. Its jurisdiction extends to the west of Guizhou in the east and Dali Prefecture in Yunnan in the west.But a few years later, he gave up because of Cuan's brutal rebellion. In the south, Emperor Yang of the Sui Dynasty destroyed Linyi State in the first year of Daye (AD 605), and once set up three new counties—Bijing, Xiangpu, and Haiyin.However, a few months after the Sui army retreated, Linyi regained its former homeland, and the southern boundary of the Sui Dynasty was still roughly at 18° north latitude, that is, the Hengshan area.

However, the most important event was the re-establishment of the administrative district in Hainan Island, which cannot but be attributed to Mrs. Xian (xianxian), the leader of the local slang tribe.The Li nationality is distributed in the Xijiang River Basin in today's Guangdong, and gradually developed to Hainan Island.Mrs. Xian not only has a high prestige among the slang, but also the Daner people on Hainan Island obey her, "those who belong to Qianyudong".Although Liang and Chen in the Southern Dynasties had set up Yazhou on Hainan Island, they could not effectively control it. Madam Xian's allegiance to the Sui Dynasty enabled the Sui Dynasty to exercise jurisdiction over Hainan Island smoothly, so after her death The three counties of Zhuya, Dan'er and Linzhen can be set up on the island.Since then, the administrative jurisdiction of the mainland government over Hainan Island has never been interrupted.

Only in the northeast, the Sui Dynasty's war against Goguryeo ended in failure, and the border was still on the Liao River.