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.
Longde County, which belongs to Guyuan City, Ningxia Hui Autonomous region, is located at the western foot of Liupan Mountain and the southern border of Ningxia. It lives in the capital cities of Yinchuan, Xi'an and Lanzhou. 312 National Highway runs through the east and west, and Qinglan Expressway passes through the border. Between latitude 35 °21-#39;-35 °47-#39; and longitude 105 °48-#39;-106 °15-#39;. East Guanshan, west overlooking Hetao, south Qinzhou, north Ningshuo; lapel belt Qinliang, support Xifu, known as "Guanlong lock key". It is 47 kilometers from north to south and 41 kilometers from east to west, and the county covers an area of 985 square kilometers. As of 2018, it has jurisdiction over 10 townships and 3 towns with a total population of 175392. The county government is stationed in Chengguan Town. As of 2