Where was the location of ancient Korea?

An ancient country name. The Qin and Han dynasties included most of the northern part of the Korean peninsula today. At the end of the Warring States period, Yan developed to the northeast, and its power once reached the south of Yalu River. At that time, North Korea was under Ji's rule. After the Qin Dynasty unified China, western Liaoning and Liaodong counties were set up to the east of Yan's hometown. During the Yan and Qin Dynasties, many immigrants from Qi and Yan regions moved to the Korean Peninsula and introduced the advanced culture of the Central Plains. In the early Han Dynasty, Wei Mandong, a Yan man, walked out of the fortress, crossed the dam water (now Qingchuan River in North Korea), killed the last Wang Jizhun in North Korea, divided North Korea, and established Wang Xiancheng (now Pyongyang in North Korea). The indigenous people on the Korean peninsula, such as Fan Zhen and Lintun, all belong to Wei Man. In the early Han Dynasty, Wei's Korea basically lived in peace.

Liu Che, the emperor of the Han Dynasty, strengthened the guards in the northern border counties to resist the Huns. In the first year of Yuan Shuo (BC 128), Canghai County was once located in Liaodong, but it was revoked three years later. In the second year of Yuanfeng (before 109), Liang Wudi ordered him to go to North Korea and ordered his king Wei Youqu (grandson of Wei Man). What is involved in killing the messenger who escorted him home? He falsely claimed that cutting North Korea would take credit. This wrong behavior caused the armed conflict between Korea and North Korea. Emperor Wu of the Han Dynasty sent Yang's servants to cross the Bohai Sea with 50,000 troops, while General Zuo Xunbi crossed the Yalu River from Liaodong to attack. In the summer of the following year, Xun Bi began to defeat the Korean army and reduce its capital. Han set up four counties in its territory: Lelang County (or named after the ancient name of "Liang Yi" in the East), with Wang Xian as the center, ruling the south of Yalu River (called Ma 'an River in ancient times) and the richest places in the north and south of Qingchuan; That is, where Ji's Korea ruled for centuries; Lintun County, which rules mainly raccoon tribes, is east of Le Lang County; Xuantu County, which ruled the southern Japanese tribe bordering the Sea of Japan in the east; Fan Zhen County, which rules the Fan Zhen tribe in southern Le Lang. The land of the four counties includes most of the peninsula, and only a small area called Chen Han in the southeast corner is still independent.

In the fifth year of Zhao Di's reign (82 BC), Fan Zhen County was stopped. In the sixth year of Yuanfeng (the first 75 years), it ended in Lintao County, and at the same time, Xuantu County was moved from the old place south of Tumen River to the north of Yalu River and east of Liaodong County. Located in the upper reaches of Hunhe River, near Xinbin, Liaoning Province, it only leads three counties. Since then, Lelang County has become the main Han county on the Korean peninsula. In the Western Han Dynasty, the county was twenty-five, and in the Eastern Han Dynasty it was reduced to eighteen. According to Gongsun Kang, at the end of the Han Dynasty, some counties in Liaodong and Gele Langzhou were classified as Fangjun County, and the number of leading counties decreased. Goguryeo was founded in Le Lang and merged with it for more than 400 years (108 ~ 3 13). In such a long period of time, China culture has been imported into North Korea in large quantities, which can be fully proved not only by written records, but also by clay sculptures, seals, weapons, lacquerware, fabrics and tiles unearthed from many Han tombs in North Korea. At the same time, Korean ancient culture was also introduced into Liaodong, western Liaoning, Youzhou and other counties.