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.
Yongjing County, which belongs to Linxia Hui Autonomous Prefecture of Gansu Province, is located in the southwest of central Gansu, in the north of Linxia Hui Autonomous Prefecture, bordering Lanzhou in the northeast, Liujiaxia Reservoir (now known as Bingling Lake) in the south, and Minhe County in Qinghai Province in the northwest. It is located between longitude 102 °53'E and latitude 35 °47'N and latitude 36 °12'N, with a total area of 1863.6 square kilometers (2010). The population is 205600 (2012). In 2012, Yongjing County achieved an annual GDP of 330 million yuan. Yongjing County has Liujiaxia, Liujiaxia Dinosaur National Geopark, Bingling Temple Grottoes and other famous scenic spots. Yongjing County, known as "Hezhou North Township", is one of the first counties open to the outside world, a key county for poverty alleviation and development, and also a Liujiaxia and salt pan.