Zhengyan Pool Introduction: Zhengyan Pool is 2,447 meters away from Fuyuan Bridge, covers an area of ​​20,000 square meters, and consists of 658 colorful pools. Zhengyan Pool is currently the most spectacular and colorful open-air travertine pool group in the world. Zhengyan Pool, developed on the left side of Huanglong Valley, is one of the most colorful pools in the Huanglong travertine landscape.