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.
Ya'an, a prefecture-level city of Sichuan Province, is located at the western edge of Sichuan Basin and the eastern foot of Qionglai Mountain, with Chengdu, Ganzi to the east, Liangshan to the south and Aba to the north, 120km away from Chengdu; it belongs to the mountainous area on the western edge of Sichuan Basin, spanning the Sichuan Basin and the Qinghai-Tibet Plateau; the climate type is subtropical monsoon humid climate; the total area of the city is 15046 square kilometers, under the jurisdiction of 2 districts and 6 counties; the total population in 2017 is 1.5378 million. Ya'an is located at the intersection of Sichuan-Tibet and Sichuan-Yunnan Highway, 120 kilometers away from Chengdu. It is the transition zone between Sichuan Basin and Qinghai-Tibet Plateau, the transition zone between Han culture and national culture, and the transition zone between modern central city and primitive natural ecological area. it was the gateway and necessary road of the ancient southern Silk Road and was once the capital of Xikang Province. It is the history and culture of Sichuan Province.