revenue increased by 20.6% compared with the same period last year. Infrastructure Nan'ao Bridge , a cross-sea bridge connecting Chenghai District and Nan'ao County, was officially opened to traffic on January 1, 2015. The bridge starts at Laiwuwei () in Chenghai District, and ends at Changshanwei (), Nan'ao County, which is connected with a loop highway which circumferences the island. Prior to the completion of Nan'ao Bridge, those who wished to travel between Nan'ao and the mainland had to use a ferry, which would not run in the event of strong winds or thick fog. The route of the bridge is long, of which the total length of the bridge is , and the total length of the connecting line is . The maximum speed of traffic traveling along the bridge is . The width of the road is , and the width of the bridge is . Wind power Located in the central part of the east peninsula, Nan'ao Wind Farm is the largest island wind farm in Asia. The local government devotes much attention to the development of wind energy resources and wind power, a renewable and pollution-free new energy source. Nine wind farms have been built in the central and eastern mountainous areas of the island. Nan'ao Wind Farm is the first project in China that realizes large-scale wind-PV complementary power generation, and creates the precedent for China's development and utilization of renewable energies. The towers may be seen when driving up the mountain roads to the turbine site. Attractions Nan'ao is the only island-wide AAAA-level tourist area in China. Historic interest The Song Dynasty Well In 1276 (during the Southern Song dynasty), the Ming emperor fled to Nan'ao in order to escape the pursuit of the Yuan army. The local residents excavated three wells to provide water for the emperor, ministers, soldiers and their horses, respectively named Dragon Well, Tiger Well and Horse Well. Over the past 700 years, the Southern Song dynasty well has appeared and disappeared from time to time. Although it is only 10 meters away from the sea, the water inside is pure and sweet. Nan'ao General Headquarters Nan'ao General Headquarters is the only island-level administrative General Headquarters in China. Because of Nan'ao's strategic geographical location, it has always been an important military site since ancient times. During the Ming dynasty, the central government sent troops here and set up a vice-general