• Tulsa
  • Qilian County

Tulsa (/ˈtʌlsə/) is the second-largest city in the state of Oklahoma and 47th-most populous city in the United States. The population was 413,066 as of the 2020 census. It is the principal municipality of the Tulsa Metropolitan Area, a region with 1,023,988 residents. The city serves as the county seat of Tulsa County, the most densely populated county in Oklahoma, with urban development extending into Osage, Rogers, and Wagoner counties.

Tulsa was settled between 1828 and 1836 by the Lochapoka Band of Creek Native American tribe and most of Tulsa is still part of the territory of the Muscogee (Creek) Nation.[a]

Historically, a robust energy sector fueled Tulsa's economy; however, today the city has diversified and leading sectors include finance, aviation, telecommunications and technology. Two institutions of higher education within the city have sports teams at the NCAA Division I level: Oral Roberts University and the University of Tulsa. As well, the University of Oklahoma has a secondary campus at the Tulsa Schusterman Center, and Oklahoma State University has a secondary campus located in downtown Tulsa. For most of the 20th century, the city held the nickname "Oil Capital of the World" and played a major role as one of the most important hubs for the American oil industry.

Qilian County, which belongs to Haibei Tibetan Autonomous Prefecture of Qinghai Province, gets its name because it is located in the hinterland of the middle part of Qilian Mountains. It is adjacent to the Gansu Hexi Corridor, the primary passage of the ancient Silk Road, to the north, so it is known as the "north gate" of Qinghai. Qilian County covers an area of 14000 square kilometers, accounting for 41% of the total land area of the whole state. It has jurisdiction over 45 administrative villages in 4 townships and 3 towns, with a total population of 50,000 as of 2013, with 15 ethnic groups, including Han, Tibetan, Mongolian and Hui, with ethnic minorities accounting for 79.2% of the population. The average elevation in the territory is 3169 meters, the county seat is 2787 meters above sea level, the annual average temperature is 1 ℃, and the annual precipitation is about 420mm, which is a typical plateau continental climate. Qilian is an important resource-rich area in Qinghai Province. A variety of mineral resources, known as "China's Ural", is a key county in the development of resources in the province. "Qilian" system
Travel Notes In Qilian County