Uyuni felt particularly long on the way to the border protection area. Although the altitudes of 3,500 meters and 5,000 meters seem to have little difference, the more and more severe headaches make people only half-sleeping and half-awake in most of the time. . Occasionally take a picture of the wilderness outside the window, the higher the vegetation, the rarer the vegetation, the thin air makes it difficult to think. Only local drivers can still stay awake in such an environment. Unrestricted self-driving allows you to run freely, but also where to look.