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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.

Dongchuan District, belonging to Kunming City, Yunnan Province, is located in the northeast of Yunnan Province and the northernmost end of Kunming City, 150km away from Kunming, adjacent to Huize County, Qujing City, Yunnan Province in the east, Xundian County, Kunming City in the south, Luquan County, Kunming City in the west, Qiaojia County, Zhaotong City, Yunnan Province in the north, and across the Jinsha River from Huili County and Huidong County, Liangshan Prefecture, Sichuan Province, with a total area of 1858.79 square kilometers. Dongchuan District is located on the northern edge of the Yunnan-Guizhou Plateau, with the highest elevation of 4344.1 meters, the lowest elevation of 695 meters, and the height difference of 3649.1 meters. Dongchuan District is rich in mineral resources and is one of the six major copper production bases in China. Jiaozi Snow Mountain is known as "the first mountain in central Yunnan". The Xiaojiang basin is a typical rainstorm and debris flow area in the world, which is called "the natural museum of debris flow". Both sides of the Xiaojiang River are Kunming.
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