• Tulsa
  • Yunnan

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.

Yunnan Province, or Yunnan for short, is one of the 23 provinces in China, located in the southwest and the capital of Kunming. Bounded by 21 °8 degrees north latitude, 29 °15 degrees north latitude, 97 °31 degrees east longitude, 106 °11 degrees east longitude, Guizhou and Guangxi in the east, Sichuan in the north, Tibet in the northwest, Myanmar in the west, Laos and Vietnam in the south, Yunnan Province has a total area of 394100 square kilometers. The topography of Yunnan Province is high in the northwest and low in the southeast, descending step by step from north to south, which belongs to the mountainous plateau topography, and the mountain area accounts for 88.64% of the total area of the province. The topography is bounded by the wide valleys of Yuanjiang Valley and the southern section of Yunling Mountains, and is divided into east and west topographic areas. The eastern part is the plateau of eastern and central Yunnan, which is part of the Yunnan-Guizhou Plateau, characterized by gently undulating low mountains and round hills.
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