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.
Hong'an, formerly known as Huang'an, is located at the southern foot of the Dabie Mountains in the northeast of Hubei Province, facing Wuhan to the south, Henan to the north, Macheng to the east, Huangpi and Dawu to the west. The county seat is 80 kilometers away from the provincial capital Wuhan and is about an hour's drive. It is an important part of Wuhan city circle. Hong'an County has a total land area of 1796 square kilometers and has jurisdiction over 12 townships and 396administrative villages. In 2017, Hong'an County has a total population of 700000, including 559000 in rural areas and 134600 in cities and towns. Hong'an is a typical agricultural county in mountainous areas, a key county in the new round of national poverty alleviation and development work, and a pilot county for the construction of old base areas across the country. Hong'an, with beautiful mountains and rivers and outstanding people, once nurtured the founder of Neo-Confucianism, famous philosophers Cheng Hao and Cheng Yi in the Northern Song Dynasty, and the "Tiantai Sangeng" (Geng Ying and Geng Ding) in the Ming Dynasty.