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.
Pingluo County, which belongs to Shizuishan City, Ningxia Hui Autonomous region, is located in the forefront of economic zones such as the National Silk Road Economic Belt, Hubao Silver Energy Golden Triangle and Ningxia Yellow City Belt, 60 kilometers away from Yinchuan Hedong Airport and 30 kilometers away from Ningxia Huinong Land Road Port. it is the only established county in Shizuishan City between longitude 105 °5742east longitude-106 °580002 "and north latitude 38 °360018"-39 °51q13 ". As of 2018, Pingluo County has a total resident population of 316000, with 13 townships under its jurisdiction, with a total area of 2060 square kilometers. The county people's government is stationed in Chengguan Town. Pingluo County is an ancient historical and cultural city, an ecological city dominated by the development of trade circulation, light industry, processing of agricultural and sideline products, science and technology and environmental protection industry and tourism.