On this day, 67 years ago, September 4, 1958 (July 21, 1958 in the lunar calendar), China declared its right to territorial waters. On September 4, 1958, the China government issued a statement on the territorial sea declaring that the territorial sea of the People's Republic of China is 12 nautical miles wide; The delineation of China's territorial waters uses the straight baseline method. The waters within the baseline, including the Bohai Bay and Qiongzhou Strait, are all China's inland seas. The islands within the baseline, including Dongyin Island, Gaodeng Island, Matsu Islands,"White Dog Islands", Wudao, Daxian Island, Dadan Island, Erdan Island, and Dongding Island, are all inland sea islands of China. The statement also announced that all foreign aircraft and military ships are not allowed to enter China's territorial waters and airspace over the territorial waters without the permission of the government of the People's Republic of China; any foreign ship sailing in China's territorial waters must abide by relevant regulations of the government of the People's Republic of China. The principles set out in the statement also apply to Taiwan and its surrounding islands, the Penghu Islands, the Dongsha Islands, the Zhongsha Islands, the Nansha Islands and other islands belonging to China.