The Yuan Dynasty inherited the policy of opening to the outside world in the Tang and Song dynasties, strengthened its political ties with overseas countries, and actively carried out overseas trade economically  There are more than 200 countries and regions related to the Yuan Dynasty, a considerable part of which were not recorded in the previous generation  The Great Triangle of Southern Africa appeared in the early Ming Dynasty (1389) and Korea's (1402)  The two pictures are similar  The author of the Korean map made it clear that it was drawn according to the two kinds of maps of the Yuan people  It can be seen that the Yuan people already have some understanding of the geographical situation of Africa  The expansion of overseas geography knowledge reflects the progress of overseas transportation
It can be considered that the overseas activities of the Yuan Dynasty laid the foundation for Zheng he's navigation in the 15th century
The Yuan Dynasty was the most developed period of maritime traffic in China