Suppose the Great Wall of China is a series of fortifications made of stone, brick, tamped earth, wood, and other materials, generally built along an east-to-west line across the historical northern borders of China. The wall runs from Shanhaiguan in the east to Lop Lake in the west, along an arc that roughly delineates the southern edge of Inner Mongolia.
Can we infer that "The Great Wall of China only covers a small portion of China's northern borders."?