Zhengyan Pool is the second largest pool group in Huanglonggou, with an altitude of 3454 meters, 1011 meters above Huanglongzhong Temple and 311 meters below Suoluoying Pool. It is the pool group with the richest and most beautiful pool embankment. The pools have different depths and different embankment vegetation. Under the sunlight, no matter from different angles of shape, color, texture, etc., each pool has its own unique and gorgeous features, giving a sense of competition.