Extended in the Ming Dynasty on the basis of the Southern Tang wall, it was 33.65 kilometers in girth, 14 to 22 meters in height and 19 meters thick at the base, ranking as the largest city in the world at that time.
Nanjing is a famous historical and cultural city. Nanjing is dominated by low hilly areas. There are dozens of hills of different sizes in Nanjing, forming a land pattern like a coiling dragon and a crouching tiger.