When is the largest territory in China?

The territory of the Yuan Dynasty was unprecedented. Today, Xinjiang, Tibet, Outer Mongolia, Yunnan, Northeast China, Taiwan Province Province and the South China Sea islands are all within the jurisdiction of the Yuan Dynasty, including most parts of Siberia (east to the Bering Sea), Sikkim, Bhutan, eastern Kashmir, northern Myanmar, northern Thailand, Laos and northeastern Korea. With a territory of over 20 million square kilometers (22 million square kilometers), it was the largest country in the world at that time.

As far as its vast territory is concerned, even the Qing Dynasty, the second largest in the future, cannot be compared with the Yuan Dynasty. According to Geographical Records of Yuan History, the territory of Yuan Dynasty is "Yinshan Mountain in the north, quicksand in the west, Liaodong in the east and sea in the south", and "Han and Tang Dynasties cannot be reached in the east and south, but it passes through the northwest". The area is twice the territory of China now. China is divided into three provinces: Zhongshu Province and ten Zhongshu Provinces, and Tibet is under the jurisdiction of Zheng Xuan Academy.