office, which was then upgraded to a General Headquarters during the Qing dynasty. Inside the headquarters there is a museum which records the history of coastal defense here. Shen'ao Ancient City Park In Kingshan village of Shen'ao town, there is an ancient wall about 5 meters high and more than 40 meters long, which is the only section of the Ming dynasty wall left in Nan'ao. It records its important history of coastal defense. The wall was repaired and renovated in 2015, around which an ancient city park was built. Inside the park there are various species of trees, including nanmu trees, peach trees, silver fir, and Spathodea campanulata. Xiongzhen Pass Xiongzhen Pass, located in the junction of Yun'ao Town and Shen'ao town, has been strategically situated from ancient times. It is included in the Chinese Famous Passes List as Shanhai Pass and Jiayu Pass of the Great Wall. The pass, which was built in 1585 during the Ming dynasty, has been repaired and expanded over the centuries. The existing wall, built in 1982, is 24 meters long, 7 meters wide and 5 meters high. Treasure Island To the northeast of Nan'ao Island, there is a small island not far from the coast, with a total area of less than 1,000 square meters, known as "Treasure Island." It is believed to have been the place where the Ming dynasty pirate, Wu Ping, hid his treasures. According to legend, during the Jiajing period of the Ming dynasty, because of the crisis of the government, official corruption, financial crisis and the severe frontier crisis, the people lived a miserable life. The pirate Wu Ping built a camp in Shen'ao bay, which eventually became Wu Ping's sphere of influence; nowadays the village is still named after him. In 1565 Wu Ping was defeated by the general who was sent by the imperial court to Nan'ao. Wu Ping hid all his treasures in the small island now known as Treasure Island, and then jumped into the sea to commit suicide. After the death of Wu Ping, there was a saying circulating among the local residents that describes the hiding place: "underwater at low tide, surface at high tide". The meaning of this sentence in local dialect is: "when the tide is high, the land cannot be immersed by water, but when tide ebbs the land is flooded", suggesting that it should be a place