• Tulsa
  • Xuanhan 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.

Xuanhan County, which belongs to Dazhou City, Sichuan Province, is located at the southern foot of Dabashan Mountain in the northeast of Sichuan Basin, between longitude 107 °22, longitude 108 °32, longitude 31 °06, latitude 31 °49, Chengkou County, Chongqing in the northeast, Kaizhou District, Chongqing in the east, Kaijiang County in the south, Dachuan District, Tongchuan District and Pingchang County in the west, and Wanyuan County in the north. Located in the joint of Sichuan, Chongqing, Hubei and Shaanxi, it is a satellite city of Dazhou. The county seat is 32 kilometers away from Dazhou City and 42 kilometers from Dazhou Airport. Xiang-Yu Railway, Chongqing-Shaanxi Expressway and Dawan Expressway pass through the border, only 2.5 hours to Chongqing. Xuanhan County covers an area of 4271 square kilometers, 31 towns, 19 townships and 4 ethnic townships. In 2016, the total registered population was 1.3234 million (permanent resident population 1.0315 million).
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