The Yuan Dynasty was the dynasty with the largest land area in the history of China, with a land area of13.72 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. ? The whole country is divided into the Gyeonggi area under the direct administration of Zhongshu, the Tubo area under the direct administration of Zheng Xuan Academy and ten Zhongshu provinces.

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.

The vassal States of the extended data yuan dynasty;

The vassal states of the Yuan Dynasty were Korea, Myanmar, Annan, Zhancheng and the four great khanates. Among them, there are two directly subordinate vassal States, namely, the Koryo Dynasty and the Bagan Dynasty in Myanmar, which are divided into the eastbound province and the central province in Myanmar. During Yuan Wenzong's reign, when compiling the Grand Ceremony of Shi Jing, Qincha khanate, Chahetai khanate and Yili khanate were listed as vassal states of the Yuan Dynasty.

Korea (9 18- 1392), also known as Korea Dynasty and Wang's Korea, is one of the ancient countries on the Korean Peninsula. In 9 18 AD, the subordinate of Gong, the monarch of Taifeng, revolted and established Wang Jianwei. In 935, Silla was merged, and after the Baekje was destroyed in 936, the "unification of the three Koreas" was realized. The capital of North Korea is Jing Kai (now Kaesong, North Korea). The territory is roughly equivalent to the south-central part of the Korean peninsula today.

Annan is an ancient name of Vietnam, named after Khufu of Annan in the Tang Dynasty. It has been the territory of China since the Qin Dynasty in China in the 3rd century BC. By the time of the Five Dynasties and Ten Kingdoms, Wu Quan was separated, Annan was separated from the Southern Han Dynasty, and the Northern Song Dynasty was unable to be unified and officially independent. Since then, Viet Nam has been a vassal state of China for a long time.

Zhancheng (137 ~ 1697) The Kingdom of Champa means Zhanpo Buluo ("Buluo" means "city" in Sanskrit), which is simply translated as Zhanpo Country, Zhanbo and Zhanbo. Located in the southeast of Indo-China Peninsula, it starts from Hengshan Pass in Ha Tinh Province in the north and reaches Pan Lang and Li Pan in Pingshun Province in the south. The king made up for Indra.

References:

Baidu Encyclopedia-Yuan Dynasty