San Diego (/ˌsæn diˈeɪɡoʊ/ SAN dee-AY-goh, Spanish: [san ˈdjeɣo]; Spanish for 'Saint Didacus') is a city on the Pacific Ocean coast of Southern California located immediately adjacent to the Mexico–United States border. With a 2020 population of 1,386,932, it is the eighth most populous city in the United States and the seat of San Diego County, the fifth most populous county in the United States, with 3,338,330 estimated residents as of 2019. The city is known for its mild year-round climate, natural deep-water harbor, extensive beaches and parks, long association with the United States Navy, and recent emergence as a healthcare and biotechnology development center. San Diego is the second largest city in the state of California, after Los Angeles.
Dingyuan County, which belongs to Chuzhou City, Anhui Province, is located in the east of Anhui Province, between latitude 32 °12'- 32 °42'N and longitude 117 °12'- 118 °5'E. it is located in the eastern part of Anhui Province, between the hinterland of eastern Anhui and the western part of the Yangtze River Delta, which is connected with Jiangsu, Zhejiang and Shanghai, covering an area of 2998 square kilometers and cultivated land of 2.469 million mu. By the end of 2017, Dingyuan County had a population of 974900 and had jurisdiction over 22 townships and 253 administrative villages. The topography of Dingyuan County is generally high in the north and low in the south. The landforms in the territory are divided into three types: hills, wavy plains and plains. In ancient times, it has the reputation of "Jinglian Bayi, Qutong nine provinces", and it is still the key point of China's north and south. The Beijing-Shanghai high-speed railway and the Huainan railway run through the territory, and the Beijing-Taiwan highway runs across the territory. Was listed as a country in 1987