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.
Zhouqu County, which belongs to Gannan Tibetan Autonomous Prefecture in Gansu Province, is located in the south of Gansu Province and in the southeast of Gannan Tibetan Autonomous Prefecture. Zhouqu means "Longjiang" in Tibetan and gets its name from the Bailong River passing through the county. Zhouqu system began in the pre-Qin period. In the 28th year of Qin Zhaowang (279 BC), Qiangdao County was located in the northwest of Zhouqu, Xigu County was set up after liberation, Zhouqu County was renamed Longdi County in 1959, and Zhouqu County was restored in 1962. By 2016, Zhouqu County had jurisdiction over 4 towns, 15 townships, 208 administrative villages and 403 natural villages, with a total population of 142000, of which 50400 were Tibetans, accounting for 35.8%. Zhouqu County is located in the Min, Dieshan system of the West Qinling Mountains and the edge of the Qinghai-Tibet Plateau, which is a typical alpine canyon landform. "one river and two rivers (Bailong River and Gongba River)