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.
Anhui, abbreviated as "Anhui", named after the first words of Anqing and Huizhou at that time, is a provincial administrative region of the people's Republic of China. Hefei, the provincial capital. Located in East China, Anhui is bounded by 114o 54km east longitude, 119o 37km east longitude and 29o 41mm north latitude, Jiangsu and Zhejiang provinces in the east, Henan and Hubei provinces in the west, Jiangxi province in the south, Shandong province in the north, and Anhui province covering a total area of 140100 square kilometers. Anhui Province is located in East China, near the Yangtze River, with 800 miles of urban agglomeration along the Yangtze River and the Wanjiang Economic Belt, with the Yangtze River waterway inside and the economic radiation of the coastal areas on the outside. The terrain is composed of plains, hills and mountains; it spans the three major river systems of the Huaihe River, the Yangtze River and the Qiantang River. Anhui Province is located in the transitional zone between warm temperate zone and subtropical zone. The north of the Huaihe River has a warm temperate semi-humid monsoon climate.