The island of the Lesser Mountain of the Immortals, the largest of West Lake's three islands, was created in the 17C. Forming something like a lake within an island within a lake, it encircles four lakes connected by four bridges which are linked by a central islet. In summer, the ponds are covered with lotus flowers. To the south of the island, Three Pagodas Mirroring the Moon (1621) appear above the water.