Created in the 17C, the Small Mountain of the Immortals Island, the largest of the lake’s three islands, encircles four lakes separated by four bridges which are connected with each other on a central islet. In summer, the ponds are covered with lotus blossom. To the south of the island, Three Pagodas Reflecting the Moon (1621) appear above the water: the symbols of Hangzhou, they are reflected in the lake during autumn full moons.