Hi, The Great Wall of China is a huge construction which starts from Yalu River in the east and ends at Jiayuguan Pass in the west, across Liaoning, Hebei, Beijing, Tianjin, Shanxi, Shaanxi, Inner Mongolia, Ningxia and Gansu Provinces. So they are all right. But the badaling great wall in Beijing is the most famous and splendid one. when people mention china great wall, they refer to the badaling great wall most probably.