Introduction to Qiugongcheng Island: Qiugongcheng Island, the ancestral home of the Liu family, appears and disappears with the rise and fall of the lake water. It is a mirage in the scenic spot. This is the birthplace of the Liu surname and the hometown of Liu Lei, the ancestor of the Liu surname in China. There are cultural relics from prehistoric, Xia, Shang, Zhou and Han dynasties scattered on the island, and it has the reputation of "the treasure of cultural relics in the Central Plains".