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.
Siping, a prefecture-level city in Jilin Province, is located in the central hinterland of Songliao Plain and at the junction of Liao, Jilin and Mongolia provinces. Siping is an important transportation hub and logistics node city in Northeast China, which leads to the Yangtze River Delta and Beijing-Tianjin-Hebei in the eastern part of Jilin, Heilongjiang and Inner Mongolia. Siping has an area of 14323 square kilometers and a population of 3.204 million, including an urban area of 1100 square kilometers and a population of 625000. Siping has jurisdiction over Tiedong District, Tiexi District, Gongzhuling City, Shuangliao City, Lishu County and Yitong County. Siping has a long history, and the site of the ancient city of Yan on the bank of Erlong Lake, 50 kilometers away from the urban area, is the witness of the Han nationality's earliest development of Northeast China. History has left cultural monuments such as Hanzhou in Liao Dynasty, Xinzhou in Jin Dynasty and Yehe Tribe in Ming Dynasty. Daqingshan Village cultural sites, Yehe ancient city ruins, Liao and Jin dynasties