I am confident that geography is a bit sloppy. I have carefully calculated the distance from Yunnan to Shanghai. If it is from Shanghai to Ruili Wan Ding, the thinnest place in Yunnan, it is about 3,500-4,000 kilometers away. If it is from Kunming to Shanghai, it will be shortened by 350 kilometers, at least 3200 kilometers (this is the geographical distance). If calculated according to the actual transportation mileage, it will be at least 3800 kilometers. It depends on where you come from in Yunnan .. It takes 8- 12 hours by plane, 3-4 days by passenger bus and 38-45 hours by train, that is, one and a half to two days, and you will know how far it is!