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.
Xintai, a county-level city under the jurisdiction of Shandong Province, is hosted by Taian City and is located in the middle of Shandong Province. It is a pilot county for building a modern big city in Shandong Province. It is located in the middle of Taiyi Mountains and belongs to the warm temperate continental monsoon climate zone. It has jurisdiction over 3 streets, 17 towns and 1 township, with a total area of 1946 square kilometers and a registered household population of 1.2742 million in 2017. Xintai had human existence in the Paleolithic Age. The unearthed teeth of Homo sapiens in Wuzhutai proved that it was once one of the birthplaces of the Chinese nation. There are three state-owned ecological public welfare forest farms in Lianhua Mountain, Taiping Mountain and Tumen. Lianhuashan is a world geological park, a national 4A scenic spot and a national forest park. The road traffic in the territory is well developed, with two expressways of Beijing-Shanghai Expressway and Taixin Expressway and Cilai, East (East Capital) Ping (Pingyi) and Wali (Jinzhong).