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.
Dulan County is located in the southeast of Haixi Mongolian-Tibetan Autonomous Prefecture of Qinghai Province. Dulan (which means "warm" in Mongolian) has a total area of 45270 square kilometers. As of 2013, the total population was nearly 100000. Mainly Han nationality, as well as Tibetan, Mongolian, Hui, Turkish and other ethnic minorities. The county people's government is stationed in Cn Wusu Town, 205 kilometers away from Delingha, the state capital, and 428 kilometers from Xining, the provincial capital. Dulan County is located in the southeast corner of Qaidam Basin. The whole territory can be divided into two geomorphological types: Khan Buda Mountain area and Qaidam Basin Plain. Gobi, desert, valley, rivers and lakes, hills, plateaus, mountains and other topography are distributed in turn. There are more than 40 rivers, such as Shaliu River, Tuoso River, Cn Wusu River and so on. It belongs to the arid continental climate of the plateau, with an average annual temperature of 2.7 ℃ and a minimum extreme temperature of-29.8.