Emperor Qin Shi Huang is also the guy who was buried alongside with the Terracota Army - although no one has excavated his tomb due to archaological evidence and historic myth that he was buried on a sea of mercury! As well as possible seismic activity from excavation might destory the necropolis. His section is referred to as the Great Wall of Qi. These were later joined together under China's first emperor, Qin Shi Huang, after uniting the region and creating the Qin empire. The original continious wall was also an amalgamation of multiple walls that date as far back as the 7th Century BC, created by the kingdoms of Zhao, Yan and Qin in the north as well as Chu further south. The great wall is not entirely one continious stretch, it may not be in clear proximity to each other, extends in vastly different directions and big chunks of it have not survived. When you look at the bigger picture, there are multiple walls and so there are multiple 'starts' and 'endings'. Thing is, that this is the Ming Dynasty section of the wall only, which is at the end of the Wall's construction history. You can see that it's generally looking like one continious line, only broken up by time. This is the one where you often see tourists marching up and down, ticking a world travel check box as they go. This is the stretch during the Ming Dynasty (1368-1644) that everyone is most familiar with, this is showing what is surviving (and what I believe is in the first image). And what really irks me is that it's only technically true if you ignore. A single line that stretches along historic borders between Mongolia and China. I keep seeing the above image appear in some form or another and claim that this is the start and the end, like the Great Wall is one single continous peice of linear architecture that exists.

Civ 6 wiki sea walls