Introduction to Yuanyang Lake: The ecological environment of Yuanyang Lake is well protected and it is named after migratory birds migrating from other places to spend the winter every year. Due to the erosion of the heavy rain and the scorching sun, the peaks at the entrance of Yuanyang Lake are gray-brown and rough, resembling an old man who has experienced vicissitudes of life and has wrinkles on his face, so he is called the "Old Man under the Moon".