Where does the Great Wall of china start and end please?

In Chinese history, many sections were built in many dynasties and states.
As far as I know, three dynasties had built their walls over 5000km. The first one was in the region of Emperor Qinshihuang. It started in Linzhao county, Gansu Provice and ends on the east part of Liaoning provincel. The second one was lasted from Xinjiang to east part of Liaoning. The third one was the Ming Great Wall, which lasted from Shanhaiguan to Jiayuguan in Gansu Province.