In 2 14 BC, after Qin Shihuang unified the Central Plains, he ordered Zhao Tuo to pacify the Lingnan area and set up three counties, namely Guilin County, Xiang County and Nanhai County, in which the central and northern Vietnam was under the jurisdiction of Xiang County. At the end of the Qin Dynasty, during the Chu and Han Dynasties, Zhao Tuo took advantage of the Central Plains Rebellion to capture Guilin County and Xiang County, claiming to be the "King of Nanyue" and establishing the "Nanyue State".

In BC 1 12, Emperor Wu of the Han Dynasty sent 65,438+10,000 troops to wage war against South Vietnam, which was destroyed, and the land of South Vietnam was incorporated into the territory. The old land of South Vietnam was designated as Jiaozhou, which governed nine counties. Since then, for more than a thousand years, central and northern Vietnam has been under the direct jurisdiction of China's successive dynasties (Han Dynasty, Soochow, Jin Dynasty, Southern Dynasty, Sui Dynasty, Tang Dynasty and Southern Han Dynasty).

Until 938 AD, the Battle of Baiteng River broke out, and the warlord Wu Quan defeated China Nanhan and became king (Nanhan: the separatist regime in the South during the Five Dynasties and Ten Kingdoms period between Tang and Song Dynasties). In 1968, Vietnam became independent, separated from China, and became a vassal state of China.

Geographical location of Vietnam:

Vietnam is located in the east of Indo-China Peninsula, bordering China, Guangxi and Yunnan in the north. The land boundary line between Vietnam and China is 1347 km long. West borders Laos and Cambodia; The east and southeast are bordered by the South China Sea. The land area is 329,000 square kilometers. Vietnam belongs to East 7 time zone. Hanoi, the capital, is later than Beijing time 1 hour.

Vietnam's terrain is long and narrow, slightly S-shaped. The longest point from north to south is about 1640 km, the widest point from east to west is about 600 km, and the narrowest point is only 50 km. The terrain is high in the northwest and low in the southeast, and 3/4 of the country is mountainous and plateau.

There are two plains, the Red River Delta and the Mekong River Delta, covering an area of 20,000 square kilometers and 50,000 square kilometers respectively, which are the main agricultural producing areas. There are mountains and plateaus in the north and northwest, and the Changshan Mountains in the middle run through the north and south.

Reference to the above content: Baidu Encyclopedia-Vietnam