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.
Dinghu District, located in the west-central part of Guangdong Province and the lower reaches of the Xijiang River, is an important part of the central urban area of Zhaoqing City and one of the main bodies of the reform and development planning of the Pearl River Delta region. The land is located in the south of the Tropic of Cancer, between longitude 112 °57 east and latitude 23 °05 north; Sanshui District of Foshan City to the east, Sihui City to the north, Gaoyao District to the south and Duanzhou District of Zhaoqing City to the west. The terrain is high in the northwest, low in the southeast, Dinghushan Group of Beiling Mountains in the north, plain in the middle, Lanke Mountain extending to the east in the south, standing across the river with Dinghushan, the highest peak is Jilong Mountain, 1000.3 meters above sea level. The total area of the region is 596 square kilometers. Changchong Village in Yongan Town in the east, Shangshuitian Village in Fenghuang Town in the west, south in Dinghu District