Introduction to the island in the middle of the lake: It was originally a natural hill under Phoenix Mountain, formed by the submergence of the lake. Although the island covers an area of ​​only about 20 acres, it is rich in vegetation. There are many trees such as Fujian and Cantonese castanopsis, crape myrtle, mountain alum, and masson pine. There are also wild teal ducks and mandarin ducks that live in pairs by the waterside in deep forests and dense grass. .