How big was the land of the Yuan Dynasty in the ancient history of China, and to what extent.

The territory of the Yuan Dynasty was about 21227,400 square kilometers. The Yuan Dynasty was the largest territory in the history of China, which not only developed its foreign relations unprecedentedly, but also spread from Asia to Europe and Africa, and its territory was unprecedented in the history of our country. The Yuan Dynasty went north to Yinshan Mountain, south to the South China Sea Islands, northeast to Sakhalin Island and northwest to Xinjiang and Central Asia.