The predecessor of the Yuan Dynasty was Great Mongolia. When Genghis Khan Temujin was founded in 1206, he had desert north and south and wooded areas (namely, Nebuchadnezzar Chu area). After successive generations of Mongolian Khan's management and three voyages to the West, its territory extends from the Sea of Japan and the East China Sea in the east, to the Black Sea and the Mediterranean Sea in the west, to Siberia in the north and to the Persian Gulf in the south, and it has established a superpower spanning Asia and Europe. During Genghis Khan's period, both the host king and the western king were enfeoffed. The host king is Temujin's younger brother, and most of them are grouped in the east and northeast of Saibei, which has a strong subordinate relationship. The kings of Xidao were all sons of Temujin, among whom Shu Chi, the eldest son, was enfeoffed in the Qincha grassland north of Aral Sea, Caspian Sea and Balkhash Lake, and then the Qincha khanate was established by Badou. The second son, Chahetai, is located in the hometown of Xiliao, north of the Syr Darya River, and is known as the Chahetai khanate in history; Sanzi Wokuotai was divided into Naiman's old land, and Houhai established Wokuotai khanate; Saibei, Handi, Northeast China, Qinghai-Tibet and Dongjiang were acquired by Tuo Lei, the youngest son, and were later directly under the jurisdiction of the Yuan Dynasty.
1279, Yuan Shizu conquered and destroyed China in the Southern Song Dynasty. According to the records in the Atlas of Chinese History, Handi, Monan, Mobei, Northeast (including Outer Manchuria and Sakhalin Island), Dongjiang (according to Tarim Basin, it reached Qingji in the west in the early Yuan Dynasty), Qinghai-Tibet Plateau, Penghu Islands, Jeju Island and South China Sea Islands were all within the jurisdiction of the Yuan Dynasty. After the Southern Song Dynasty, although there were many conflicts with Japan, Myanmar, Annan, Java and other countries, the territory generally tended to be stable. 13 10 During the Yuan Wuzong period, the Wokuotai khanate was divided between the Yuan Dynasty and the Chahetai khanate, and the Yuan Dynasty acquired the Moxi territory of the Wokuotai khanate, with a land area of13.72 million square kilometers (the northern Xinjiang is bounded by 55 north latitude). If the northern Xinjiang extends to the Arctic Ocean, it will be 22.67 million square kilometers.
The territory of the Yuan Dynasty started from the Sea of Japan in the east, the South China Sea in the south, Tianshan Mountain in the west and Lake Baikal in the north. "History of the Yuan Dynasty" "The quicksand in the left and west of Liao is exhausted in the east, and the Yinshan Mountain in the north crosses the sea in the south, which is not as good as that in Han and Tang Dynasties". The whole country is divided into Gyeonggi area directly under the jurisdiction of Zhongshu Province (that is, parts of southern Hebei, Shandong, Shaanxi and Shaanxi), Tubo area under the jurisdiction of Zheng Xuan Institute (formerly known as General Institute), and ten Zhongshu provinces, namely Lingbei Province, Liaoyang Province, Gansu Province, Shaanxi Province, Jiangbei Province of Henan Province, Huguang Province, Sichuan Province, Yunnan Province and Jiangsu and Zhejiang Province.