From Qinghai Lake to Chaka, we need to cross the rubber mountain. The driver told us that the rubber mountain was named because the road foundation on the mountain was soft, easy to sink, and flexible. The rubber mountain range stretched all the way, the car was driving on the road and climbing. When we saw that there were small hills nearby, we reached the top of the mountain at 3817 altitude. The psychological factors were slightly higher, but they were not shadowed as soon as they went down the mountain.