• Tulsa
  • Derong

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.

Derong County, which belongs to Ganzi Prefecture, Sichuan Province, is located in 99 °07 east longitude and 29 °10 'north latitude. Located in the southwest of Sichuan Province, it is located in the middle of the Great Shangri-La Tourism Ring at the junction of Sichuan, Yunnan and Tibet. Derong County belongs to the dry valley of the Jinsha River, which is connected with Batang and Xiangcheng County of Ganzi Prefecture in the north, Shangri-La County of Diqing Prefecture of Yunnan Province in the southeast and Deqin County of Diqing Prefecture of Yunnan Province in the southwest. It is 670km away from the state capital Kangding, 1040 km away from Chengdu (Kangding direction), and about 1477 km from Yunnan to Chengdu. In 2017, Derong County has an area of 2916 square kilometers and has jurisdiction over 3 towns and 9 townships, including 127villages, 3 communities and 251natural villages. By the end of 2017, Derong County has a total population of 25859.
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