San Jose,[A] officially San José (/ˌsæn hoʊˈzeɪ, -ˈseɪ/; Spanish: [saŋ xoˈse]; Spanish for 'Saint Joseph'),[B] is a major city in the U.S. state of California that is the cultural, financial, and political center of Silicon Valley and largest city in Northern California by both population and area. With a 2020 population of 1,013,240, it is the most populous city in both the Bay Area and the San Jose-San Francisco-Oakland Combined Statistical Area, which contain 7.7 million and 9.7 million people respectively, the third-most populous city in California (after Los Angeles and San Diego and ahead of San Francisco), and the tenth-most populous in the United States. Located in the center of the Santa Clara Valley on the southern shore of San Francisco Bay, San Jose covers an area of 179.97 sq mi (466.1 km2). San Jose is the county seat of Santa Clara County and the main component of the San Jose–Sunnyvale–Santa Clara Metropolitan Statistical Area, with an estimated population of around two million residents in 2018.
Chengxian, which belongs to Longnan City, Gansu Province, is located in the south of Gansu Province and the northeast of Longnan City. Chengxian was called Chengzhou in ancient times, Chengzhou in the Western Wei Dynasty and Jiangzhou as a county in the Ming Dynasty. Cheng County has jurisdiction over 14 towns and 3 townships, 15 neighborhood committees and 245 villagers' committees, with a total area of 1676.54 square kilometers, a total population of 269800 and a resident population of 246800, of which the urban population is 120200, and the urbanization rate is 48.7% (2018). Chengxian County is located in the residual vein of the West Qinling Mountains, the terrain is high in the northwest, low in the southeast, between 750m and 2377 meters above sea level, is a warm temperate semi-humid climate, four distinct seasons, moderate cold and warm, known as "Longyou small Jiangnan", "Longyou granary". Chengxian County is rich in natural resources, including mineral resources, water resources, biological resources and so on.