Introduction to the windmill mouth: The windmill mouth is also called the "big wind mouth". It is located in the west of Tonggubao, 7.7 kilometers away from Yunzhong Lake, and 1,400 meters above sea level. The big windmill mouth is about 2,000 meters wide, and the small windmill mouth is about 30 meters wide. It is even bigger, because the cliffs on the east and west sides stand up, forming a scissors-shaped valley mouth. The air currents from the north and south of the mainland are blocked by the mountains and meet at the fork of the mountain peaks. Therefore, the wind is howling every day all year round. Visitors often find it difficult to stand here. They always feel as if there are a hundred electric fans blowing at you. The clouds and winds flow day and night, just like the Alila Pass, a famous wind outlet in the Kunlun Mountains of Xinjiang.