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.
Lixian belongs to Baoding City, Hebei Province, the hinterland of Beijing, Tianjin and Stone Triangle, and the junction of Baoding, Cangzhou and Hengshui. Lixian has a total area of 650 square kilometers. In 2013, Lixian has a total population of 510000, including an agricultural population of 400000. Lixian has 13 townships (8 towns and 5 townships) and 232 administrative villages. Lixian County is located in the middle of the plain of the western structural belt of Jizhong Depression, Bohai Bay Basin. The topography and geomorphology are all plain formed by Quaternary alluvial and alluvial deposits. The general topography is high in the southwest and low in the northeast, with an average altitude of 15.6 meters. There is no obvious fluctuation. Lixian is a warm temperate semi-arid region in the eastern monsoon region, with significant continental monsoon climate, windy and dry spring, rainy and hot summer, crisp autumn, dry and cold winter, four distinct seasons, light and heat, and rich water resources. two