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.
Pingxiang, a city under the jurisdiction of Jiangxi Province (prefectural level), an important member of the urban agglomeration in the middle reaches of the Yangtze River, is located in the west of Jiangxi Province, bordering Yichun City in the east, Ji'an City in the south, Zhuzhou City in Hunan Province in the west and Liuyang City in Hunan Province in the north. The landform is more complex and belongs to the subtropical humid monsoon climate zone with four distinct seasons; it has jurisdiction over 3 counties and 2 districts with a total area of 3823.99 square kilometers and has a resident population of 1.9332 million at the end of 2018. In 2018, Pingxiang achieved a regional gross domestic product (GDP) of 100.905 billion yuan, an increase of 8.7% over the previous year. Pingxiang is the "west gate" of Jiangxi, which is in the central position in the economic development pattern of western Jiangxi. It is known as "the thoroughfare of Hunan and Jiangxi" and "the throat of Wu and Chu". Pingxiang is located in the radiation core area of the Changsha-Zhuzhou-Xiangtan economic circle and accepts the Pan-Pearl River Delta.