The territory of the Yuan Dynasty was unprecedented. Judging from today's geographical situation, from the eastern coast to Xinjiang in the west, from the South China Sea in the south to most parts of Siberia in the north, and from Tibet and Yunnan in the southwest to the Sea of Okhotsk in the northeast, they are all within the scope of the unified regime of the Yuan Dynasty.
Geography of the Yuan Dynasty records: "From feudalism to counties, there were people in the world, and Han, Sui, Tang and Song flourished, but the territory was vast and salty. Han terrier lived in the northern emperor, and Sui could not serve Dongyi. Tang suffered from Xirong, and Song often suffered from the northwest. If it's Yuan, start from Shuomo, merge with the western regions, pacify Xixia, destroy Nuzhen, minister Koryo, decide Nanzhao, and then go to Jiangnan, and the world will be a family. Therefore, its land exceeds Yinshan Mountain in the north, quicksand in the west, Liaozuo in the east and sea surface in the south. " By the Tang Dynasty, Jimizhou County in the border area was almost the same as the mainland in the Yuan Dynasty, and the areas previously ruled by ethnic minority regimes were formally incorporated into the territory of the Yuan Dynasty.
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