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.
Nanshan District, which belongs to Shenzhen City, Guangdong Province, is located in the central and western part of Shenzhen City. The administrative area is adjacent to Chegong Temple and Futian District in the east, Anle Village and Chiwei Village in the west, Baoan District and Longhua District in the north, Shekou Port, Dachan Island and Neilingding Island in the south, Yuen long in Hong Kong in the southeast and Macao and Zhuhai in the southwest. The area covers an area of 187.47 square kilometers and the coastline is 43.7km long. Nanshan District is located in the subtropical zone, bordering the South China Sea, with a subtropical maritime climate. It is warm and humid in four seasons, high in the north and low in the south, with flat land, platform and hills alternating with each other, descending step by step from north to south. The main peaks are Yangtai Mountain, Tanglang Mountain, Danan Mountain and so on. As of 2016, Nanshan District has jurisdiction over 8 streets. In 2015, the permanent residents of the whole district