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.
Jiayu County, the ancient name of Shayangbao, gets its name from the meaning of "Jiayu in the south of the Book of songs". It is a county under the jurisdiction of Xianning City, Hubei Province, located in longitude 113 °39mm east and latitude 29 °48mm. It is located on the south bank of the middle reaches of the Yangtze River, bordering Wuhan to the north, Chibi to the south, Xianning to the east and Honghu to the west, and is an important part of Wuhan city circle. Jiayu County has a narrow terrain, 85 kilometers long and 5.7 kilometers wide, with a total area of 1017 square kilometers in 2016, including a land area of 712 square kilometers and a water area of 305 square kilometers. It has jurisdiction over 8 towns with a total population of 366577 (2018). Jiayu County is the first batch of areas open to the outside world and the Yangtze River economic belt.