Introduction to Shuangqiao Qingyin: Qingyin Pavilion is located in the center of the uphill and downhill mountains of Emei. Together with Longmen Cave, it is known as "water wins two wonders". Facing Qingyin Pavilion, a picture of green mountains and green water unfolds. The Black Dragon Pool under the Jiulao Cave and the Sancha River under the Gongbei Mountain converge, impacting the huge boulders in the Bitan that are shaped like the heart of an ox.