How long is the best-preserved Ming dynasty section of the Great Wall?

The best-preserved section of the Great Wall of China, which dates from the Ming dynasty, extends for approximately 5,500 miles (8,850 km).1

This stretch runs from Mount Hu in the east to the Jiayu Pass in the west. While this figure represents the total length of the Ming-era wall, it is important to note that about one-fourth of this distance consists of natural defensive barriers, such as rivers and mountain ridges, rather than constructed masonry.1