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. Several walls were being built from as early as the 7th century BC; later linked together and made bigger and stronger, the collection of walls now stretches over 13,000 miles.
Can we infer that "The Great Wall of China is the longest wall in the world."? Yes, no, or maybe?