tel me more adout the great wall.how long is it?

告诉我更多的关于长城的
它有多长？

告诉我更多关于长城的事,它有多长呢?

The Great Wall is one of the existing megastructure and the world's longest man-made structure, stretching over 6,352 km (3,948 miles) from Shanhai Pass in the east to Lop Nur in the west, along an arc that roughly delineates the southern edge of Inner Mongolia.

告诉我更多关于长城的事。它多长？