• Tulsa
  • Youyi 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.

Youyi County is located in the western part of Shuangyashan City, Heilongjiang Province, under the jurisdiction of Shuangyashan City. The geographical location is 46 °28 °14 "~ 46 °59 °38" N and 131 °27 °50 "~ 132 °15'E. It is located in the hinterland of Heilongjiang, Songhua River and Wusuli River. It is adjacent to Baoqing County in the east, Shuangyashan City in the south, Jixian County in the west and Fujin City in the north. The terrain in Friendship County is flat and low-lying, with hills in the southwest and lowlands in the northeast, tilting from southwest to northeast. In 2012, Youyi County has a total population of 125000. The total area is 1888 square kilometers. Youyi County has a mid-temperate continental climate, with an average annual temperature of 2.5C, an average annual rainfall of 500mm, an average of 2730 hours of light, and a frost-free period of 120.1.
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