The dynasty with the largest land area in China was the Yuan Dynasty. 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 territory includes the whole North Asia, Mongolia and the western region, with an area of 1330 reaching13.72 million square kilometers.