habitat for egrets. Fronting water and with a hill at the back, the park has a dense growth of trees. Every February and March the park becomes a sea of blossoming rape plants. Villages Back garden village The Back Garden village is located to the north of Guolao Mountain which is in the central part of Nan'ao Island, with an altitude of 400–500 meters and a forest coverage rate of 90%. It has a pleasant climate, no bitter cold in winter or torrid heat in summer. Because of its high peaks, fertile land and dense forests, it is suitable for the development of planting and aquaculture, especially tea planting. Fishing village The fishing village is located in the Lieyu bay of Shen'ao town. The waters here are wide and calm. It used to be an important ferry place of the ancient maritime Silk Road and ancient battlefield. Nowadays, it has become a seafood farm, where groupers, abalones, pearls, seaweed, shellfish and other valuable seafood are cultivated. Viewpoints and amenities Maritime Silk Road Square The Maritime Silk Road Square (Haisi square), which completed its construction before the Spring Festival of 2018, is an important part of the Blue Bay Rehabilitation Project of the local government. It now serves as a sitting-out area with sea views, for local residents and tourists. The statues on the square show the cultural connotation of this island, which used to be a node of the maritime silk road in ancient times. From the square there are walking routes along the coastal corridor to the Beisha Bay and the Qianjiang Bay. Sailing Square The sailing square, which is the first sightseeing spot after entering the island from the Nan'ao bridge, has now become a combination of parking lot, sitting-out area, coastal sightseeing point and commercial street. With a view of the sea-crossing bridge, it is popular with photographers. Gate of Nature The Gate of Nature is located on the Square of the Tropic of Cancer in Qing'ao bay. The design of the tower evolved from the Chinese character "door" . The radius of the sphere is 3.21 meters (corresponding to March 21, Spring Equinox), the cantilever length is 6.22 meters (corresponding to the summer solstice on June 22), the height of the tower is 12.22 meters (corresponding to the winter solstice on December 22), and the inclination angle of the two portal pillars corresponds to 23.50 North