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.
Xianning, a prefecture-level city in Hubei Province, is located in the southeast of Hubei Province, on the south bank of the middle reaches of the Yangtze River, bordering Hunan and Jiangxi. Known as "the south gate of Hubei", it is an important member of the Wuhan urban circle and the urban agglomeration in the middle reaches of the Yangtze River; mild climate, abundant precipitation, sufficient sunshine, four distinct seasons, long frost-free period; the terrain is high in the south and low in the north; under its jurisdiction: Xianan District, Tongcheng County, Tongshan County, Jiayu County, Chongyang County, Chibi City. The total population in 2017 is 2.5351 million. Xianning has won the China Human settlement Environment Model Award, the most suitable human settlement city in China, the charming city in China, the hot spring city in China, the ten most growing and innovative cities in China, and the second batch of renewable energy building application demonstration cities in China. Hubei Province, the first batch of low-carbon economy pilot cities, the first batch of national tourism standardization cities, national forest cities.