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.
Xishui County, a county under the jurisdiction of Huanggang City, Hubei Province, China, is an important part of Wuhan city circle. The total area is 1949.3 square kilometers, with a population of 1.08 million in 2016. Xishui County was formerly known as Qishui County. In order to avoid being confused with the name of Qichun County, the Republic of China was changed to Xishui County in 22 years (1933). Xishui County is located in the southern foot of the Dabie Mountains, eastern Hubei, the north bank of the middle reaches of the Yangtze River, Xishui County is located in the southern foot of the Dabie Mountains, eastern Hubei, the north bank of the middle reaches of the Yangtze River, belonging to Huanggang City. Located in the Yangtze River open development zones of Jiujiang, Huangshi and Wuhan, the Yangtze River waterway, Liujie Highway and Hu-Rong Expressway are in parallel transit; the Huangshi Yangtze River Bridge spans the Xishui River and scattered flowers; and the Beijing-Kowloon Railway runs across the territory and has two passenger and cargo stations, forming a network of railways, highways and waterways extending in all directions. There are 15 counties under the jurisdiction of Xishui county