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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.

Xining, known as Qingtang City, Xiping County and Shanzhou in ancient times, is the capital of Qinghai Province, the political, economic, scientific and educational, cultural, transportation and communication center of Qinghai Province, and an important central city in the northwest region approved by the State Council. By 2019, the city had jurisdiction over five districts and two counties, with a total area of 7660 square kilometers, a built-up area of 129 square kilometers, a resident population of 2.3711 million, an urban population of 1.7098 million, and a urbanization rate of 72.1 percent. Xining is located in the eastern part of Qinghai Province, swimming in the river valley basin in the Huangshui River. It is the eastern gateway of the Qinghai-Tibet Plateau and the necessary place for the ancient "Silk Road" South Road and "Tangbo Ancient Road". It has been the northwest traffic road and military important place since ancient times. Known as the "key to the West Sea" and the throat of the sea, it is one of the high-altitude cities in the world and is also the State Council.
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