The Sun Moon Lake has a wide surface, and the peaks reflected on the lake form a beautiful landscape. There is a small island in the lake. It looks similar to a bead floating on the water, so it is called "Zhuzi Yu". Now it is also called Lalu Island. With this island as the boundary, the northern part of the lake is round like the sun, and the southern part of the lake is similar to a crescent. This is the reason for the name of Sun Moon Lake.