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.
Heyang County, known as Xinguo, is located in the northeast of Guanzhong Basin in Shaanxi Province and on the west bank of the Yellow River, belonging to Weinan City, with a total area of 1437 square kilometers and a cultivated land area of 932000 mu, with a total population of 459000 (2016) in 11 towns, 1 subdistrict office and 215 administrative villages (communities). Heyang County is a national ecological demonstration county and a national pollution-free fruit production base county with an average altitude of 721m, an annual average temperature of 11.5m and a rainfall of 553mm. It is a national ecological demonstration county and a national pollution-free fruit production base county. Wheat, apple, red grape, dairy livestock, aquatic products, sweet potatoes, pigs and other characteristic agricultural products are famous in the northwest. Heyang County is located in the forefront of the western development, 108 National Highway runs through the whole territory, Xiyu Expressway passes through 8 townships of the county and runs directly to the county seat, and Xihou Railway runs from south to north.