San Antonio (/ˌsæn ænˈtoʊnioʊ/ SAN an-TOH-nee-oh; Spanish for "Saint Anthony"), officially the City of San Antonio, is a city in Texas, United States. The city is the seventh-most populous in the United States, the second-largest in the Southern United States, and the second-most populous in Texas. It is the 12th most-populous city in North America, with 1,434,625 residents in 2020.
Founded as a Spanish mission and colonial outpost in 1718, the city in 1731 became the first chartered civil settlement in what is now present-day Texas. The area was then part of the Spanish Empire. From 1821 to 1836, it was part of the Mexican Republic. It is the oldest municipality in Texas, having celebrated its 300th anniversary on May 1, 2018.
Chengguan District, which belongs to Lanzhou City, Gansu Province, is located in the central and eastern part of Gansu Province, between longitude 103 °46km east and latitude 35 °58km. It is 20.02 km long from east to west, 22.6 km wide from north to south and covers an area of 220 square km. Chengguan District is the central area of Lanzhou, the capital of Gansu Province, where the party, government and military organs are stationed, and the political, economic, scientific, technological and cultural center of the province. The geomorphology is characterized by the crossing of the Yellow River between the north and south mountains. The Yellow River enters the Yellow River Estuary from the Leitan River, and Gaolan Mountain and Baita Mountain face each other from the north to the south. Chengguan District is a mid-temperate semi-arid zone, the average elevation in the urban area is 1520 meters, the highest peak is Yingpanling in the southeast of Gaolan Mountain, 2171 meters above sea level, and the lowest is the north beach of Yantan, 1503 meters above sea level. The annual average temperature is 1.