“One Line Sky” is a amazing picture in Heilong River path which is a nature landscape near Qingyingge Pavilion. The Heilong River run out of a underground cave named Jiulao Cave, and run through Heilong pond, Hongchunping then to Qingying Pavilion. It has curved a deep narrow valley in thousands of years. The river path beside the river is right in the bottom of the valley, that was the only way into the Emei mountain. Standing in the path, and look above, you will get the picture “One Line Sky”