• Tulsa
  • Yijun 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.

Yijun County, which belongs to Tongchuan City, Shaanxi Province, is located in the middle of Shaanxi Province, in the north of Tongchuan City, and at the junction of Guanzhong Plain and Northern Shaanxi Loess Plateau. The county seat is 120km south from the provincial capital Xi'an and 27km north from the Huangdi Mausoleum of Xuanyuan, with a total area of 1531 square kilometers. National Highway 210 and Tonghuang first-class highway pass through the border, known as the "flyover from Guanzhong to northern Shaanxi". Yijun County is not only named because of Yijun water, but also because it is suitable for kings to spend the summer. There are Yangshao cultural sites, Pengzu hometown, Northern Wei grottoes, Jiangnu tear Spring, Yunmeng Mountain Taoist resort, the warring States and Wei Great Wall, among which Yijun and the warring States Wei Great Wall was included in the World Cultural Heritage list of the Great Wall of China. As of 2018, Yijun County has jurisdiction over 1 street, 6 towns and 1 township. In 2017, the resident population of Yijun County was 92100.
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