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.
Zhangdian District, Zibo Municipal District, Shandong Province, is located in the middle of Zibo City; the terrain slows down gradually from south to north, and belongs to the warm temperate monsoon semi-dry and semi-humid continental climate zone; it has jurisdiction over 6 towns and 7 streets, with a total area of 244 square kilometers; the total population in 2017 is 687121. Zhangdian District is the transportation and communication hub in central Shandong and one of the important node cities in Jinan metropolitan area. It is 70 kilometers away from Jinan International Airport, 210 kilometers away from Qingdao Port and 380 kilometers away from Yantai Port. Jiaoqing Expressway and Binlai Expressway meet here. Jiaoji Railway and 309 National Highway run from east to west, National Highway 205 runs from north to south, and 16 trunk highways lead to the whole country. After the completion of the north line of the Ji-Qing high-speed railway, it will reach Jinan in 20 minutes, Qingdao in 1 hour and Beijing in 2 hours. 2017