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.
Lianyuan City, which belongs to Loudi City, Hunan Province, is located in the central part of Hunan Province, the northern margin of Hengshao Basin, the upper reaches of Lianshui and Sunshui. Lianyuan City, with a total area of 1830 square kilometers, has jurisdiction over 19 township offices and 1 high-tech zone, with a resident population of 983000 by the end of 2017. Lianyuan is located in the geometric center of Hunan and is an important transportation hub in central Hunan. Lou-Xin Expressway, Changshaolou Expressway, Erguang Expressway and Shanghai-Kunming High-speed Railway run through the whole territory. Lianyuan City is rich in natural resources, known as "sea of coal", "hometown of building materials" and "hometown of non-ferrous metals". It is Hunan energy and raw material base, 100 key coal-producing counties and cities, national well-known coal machinery production base, and national grain-producing counties. In 2018, Lianyuan City achieved a GDP of 29.06 billion yuan.