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.
Pengshan District is the municipal district of Meishan City, Sichuan Province, known as Wuyang in ancient times. Pengshan covers an area of 465.32 square kilometers and has jurisdiction over two subdistrict offices, eight towns and three townships, with a permanent population of 320100 in 2017. Pengshan is the hometown of longevity in China, the production base of Chinese commercial grain and lean pigs, and the national ecological demonstration area. Pengshan District is bordered by Renshou County in the east, Dongpo District in the south, Pujiang County and Qionglai City in the west, and Xinjin County and Shuangliu District in Chengdu in the north. Pengshan is the main habitat of Pengzu, the first ancestor of Chinese birthday, and is known as the "hometown of longevity". It is the only "hometown of longevity in China" demonstrated by multi-disciplinary experts.