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.
Guanghan, a county-level city under the jurisdiction of Sichuan Province, is hosted by Deyang City. Known as Hanzhou in ancient times, also known as Yancheng, it is the first pilot county (city) in Sichuan to expand its power. It is 18 kilometers north of Jingyang District of Deyang City and 24 kilometers south of Chengdu City. It is located at the western foot of Longquan Mountains in the northeast of Chengdu Plain. Guanghan belongs to the humid climate zone in the middle subtropical zone of Sichuan Basin; it has jurisdiction over 9 townships and 3 streets with a total area of 538 square kilometers and has a registered population of 604000 in 2017. Guanghan is located in the core area of the hinterland of "the land of abundance". Since ancient times, it has been said that "the gate of Yizhou, the main thoroughfare of Shu province and the way to Beijing" is the north gate of Chengdu. Sanxingdui site in Guanghan is an ancient Shu cultural site about 5000 to 3000 years ago, which is regarded as one of the greatest archaeological discoveries of mankind in the 20th century, indicating the Yangtze River valley and the Yellow River.